Environmental Protection Agency (EPA) Administrator Scott Pruitt attends a 2018 Hurricane Briefing at the Federal Emergency Management Agency (FEMA)  headquarters in Washington, DC, on June 6, 2018. - US President Donald Trump and First Lady Melania Trump also attended the meeting. (JIM WATSON/AFP/Getty Images)
JIM WATSON/AFP/Getty Images
Environmental Protection Agency (EPA) Administrator Scott Pruitt attends a 2018 Hurricane Briefing at the Federal Emergency Management Agency (FEMA) headquarters in Washington, DC, on June 6, 2018. - US President Donald Trump and First Lady Melania Trump also attended the meeting. (JIM WATSON/AFP/Getty Images)
Now playing
04:22
Whistleblower: EPA's Pruitt kept secret calendar to hide meetings
Environmental Protection Agency (EPA) Administrator Scott Pruitt testifies about the fiscal year 2018 budget during a Senate Appropriations Subcommittee on Interior, Environment, and Related Agencies hearing on Capitol Hill in Washington, DC, June 27, 2017. / AFP PHOTO / SAUL LOEB        (Photo credit should read SAUL LOEB/AFP/Getty Images)
SAUL LOEB/AFP/Getty Images
Environmental Protection Agency (EPA) Administrator Scott Pruitt testifies about the fiscal year 2018 budget during a Senate Appropriations Subcommittee on Interior, Environment, and Related Agencies hearing on Capitol Hill in Washington, DC, June 27, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Now playing
02:46
EPA chief Scott Pruitt resigns
trump-firing-resignations-removals-2018-orig-mg_00000615.jpg
trump-firing-resignations-removals-2018-orig-mg_00000615.jpg
Now playing
02:50
Trump administration's big exits in 2018
EAST CHICAGO, IN - APRIL 19:  U.S. EPA Administrator Scott Pruitt makes a statement to the media after meeting residents from and taking a brief tour of the West Calumet Housing Complex on April 19, 2017 in East Chicago, Indiana.  Nearly all the residents of the complex were ordered to move by the East Chicago Housing Authority after the soil and many homes in the complex were found to contain high levels of lead. The area has been declared an EPA superfund site. This was Pruitt's first visit to a superfund site since being named the agency's administrator. The complex is scheduled for demolition.  (Photo by Scott Olson/Getty Images)
Scott Olson/Getty Images
EAST CHICAGO, IN - APRIL 19: U.S. EPA Administrator Scott Pruitt makes a statement to the media after meeting residents from and taking a brief tour of the West Calumet Housing Complex on April 19, 2017 in East Chicago, Indiana. Nearly all the residents of the complex were ordered to move by the East Chicago Housing Authority after the soil and many homes in the complex were found to contain high levels of lead. The area has been declared an EPA superfund site. This was Pruitt's first visit to a superfund site since being named the agency's administrator. The complex is scheduled for demolition. (Photo by Scott Olson/Getty Images)
Now playing
01:44
Lawmakers want probe of Pruitt's secret calendar
WASHINGTON, DC - JANUARY 18: Oklahoma Attorney General Scott Pruitt, President-elect Donald Trump's choice to head the Environmental Protection Agency, testifies during his confirmation hearing before the Senate Committee on Environment and Public Works on Capitol Hill January 18, 2017 in Washington, DC. Pruitt is expected to face tough questioning about his stance on climate change and ties to the oil and gas industry.   (Photo by Aaron P. Bernstein/Getty Images)
Aaron P. Bernstein/Getty Images
WASHINGTON, DC - JANUARY 18: Oklahoma Attorney General Scott Pruitt, President-elect Donald Trump's choice to head the Environmental Protection Agency, testifies during his confirmation hearing before the Senate Committee on Environment and Public Works on Capitol Hill January 18, 2017 in Washington, DC. Pruitt is expected to face tough questioning about his stance on climate change and ties to the oil and gas industry. (Photo by Aaron P. Bernstein/Getty Images)
Now playing
02:19
Why Scott Pruitt may be getting a pass
Pete Marovich and MANDEL NGAN/AFP/Getty Images
Now playing
02:39
Pruitt appealed to Trump to get Sessions' job
EAST CHICAGO, IN - APRIL 19:  U.S. EPA Administrator Scott Pruitt makes a statement to the media after meeting residents from and taking a brief tour of the West Calumet Housing Complex on April 19, 2017 in East Chicago, Indiana.  Nearly all the residents of the complex were ordered to move by the East Chicago Housing Authority after the soil and many homes in the complex were found to contain high levels of lead. The area has been declared an EPA superfund site. This was Pruitt's first visit to a superfund site since being named the agency's administrator. The complex is scheduled for demolition.  (Photo by Scott Olson/Getty Images)
Scott Olson/Getty Images
EAST CHICAGO, IN - APRIL 19: U.S. EPA Administrator Scott Pruitt makes a statement to the media after meeting residents from and taking a brief tour of the West Calumet Housing Complex on April 19, 2017 in East Chicago, Indiana. Nearly all the residents of the complex were ordered to move by the East Chicago Housing Authority after the soil and many homes in the complex were found to contain high levels of lead. The area has been declared an EPA superfund site. This was Pruitt's first visit to a superfund site since being named the agency's administrator. The complex is scheduled for demolition. (Photo by Scott Olson/Getty Images)
Now playing
01:56
Conservatives turn on embattled EPA chief
In this May 16, 2018, photo, Environmental Protection Agency Administrator Scott Pruitt appears before a Senate Appropriations subcommittee on the Interior, Environment, and Related Agencies on budget on Capitol Hill in Washington. Pruitt claimed credit for pollution cleanups done mostly by the Obama administration while flubbing facts about his 2017 condo deal and blaming underlings for his ethical woes. (AP Photo/Andrew Harnik)
Andrew Harnik/AP
In this May 16, 2018, photo, Environmental Protection Agency Administrator Scott Pruitt appears before a Senate Appropriations subcommittee on the Interior, Environment, and Related Agencies on budget on Capitol Hill in Washington. Pruitt claimed credit for pollution cleanups done mostly by the Obama administration while flubbing facts about his 2017 condo deal and blaming underlings for his ethical woes. (AP Photo/Andrew Harnik)
Now playing
02:11
WaPo: Pruitt enlisted aide to get wife a job
Now playing
01:14
Pruitt interrupted by protester holding lotion
WASHINGTON, DC - MAY 16:  EPA Administrator Scott Pruitt, testifies during a Senate Appropriations Subcommittee hearing on Capitol Hill, May 16, 2018 in Washington, DC. The Subcommittee is hearing testimony on the proposed budget estimates for FY2019 for the Environmental Protection Agency.  (Photo by Mark Wilson/Getty Images)
Mark Wilson/Getty Images North America/Getty Images
WASHINGTON, DC - MAY 16: EPA Administrator Scott Pruitt, testifies during a Senate Appropriations Subcommittee hearing on Capitol Hill, May 16, 2018 in Washington, DC. The Subcommittee is hearing testimony on the proposed budget estimates for FY2019 for the Environmental Protection Agency. (Photo by Mark Wilson/Getty Images)
Now playing
02:43
Dems ask FBI to investigate Scott Pruitt
Environmental Protection Agency (EPA) Administrator Scott Pruitt testifies about the fiscal year 2018 budget during a Senate Appropriations Subcommittee on Interior, Environment, and Related Agencies hearing on Capitol Hill in Washington, DC, June 27, 2017. / AFP PHOTO / SAUL LOEB        (Photo credit should read SAUL LOEB/AFP/Getty Images)
SAUL LOEB/AFP/Getty Images
Environmental Protection Agency (EPA) Administrator Scott Pruitt testifies about the fiscal year 2018 budget during a Senate Appropriations Subcommittee on Interior, Environment, and Related Agencies hearing on Capitol Hill in Washington, DC, June 27, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Now playing
01:23
WaPo: Pruitt used EPA aide to help wife
WASHINGTON, DC - DECEMBER 7:  Environmental Protection Agency Administrator Scott Pruitt testifies before the House Energy and Commerce Committee about the mission of the U.S. Environmental Protection Agency on December 7, 2017 in Washington, DC.  (Photo by Pete Marovich/Getty Images)
Pete Marovich/Getty Images/FILE
WASHINGTON, DC - DECEMBER 7: Environmental Protection Agency Administrator Scott Pruitt testifies before the House Energy and Commerce Committee about the mission of the U.S. Environmental Protection Agency on December 7, 2017 in Washington, DC. (Photo by Pete Marovich/Getty Images)
Now playing
02:06
EPA spent nearly $3.5M on security for Pruitt
EPA Administrator Scott Pruitt testifies before the House Appropriations Committee during a hearing on the 2019 Fiscal Year EPA budget at the Capitol on April 26, 2018 in Washington, DC. (Alex Edelman/Getty Images)
Alex Edelman/Getty Images
EPA Administrator Scott Pruitt testifies before the House Appropriations Committee during a hearing on the 2019 Fiscal Year EPA budget at the Capitol on April 26, 2018 in Washington, DC. (Alex Edelman/Getty Images)
Now playing
01:52
Aide sought used Trump hotel mattress for Pruitt
WASHINGTON, DC - JANUARY 18: Oklahoma Attorney General Scott Pruitt, President-elect Donald Trump's choice to head the Environmental Protection Agency, testifies during his confirmation hearing before the Senate Committee on Environment and Public Works on Capitol Hill January 18, 2017 in Washington, DC. Pruitt is expected to face tough questioning about his stance on climate change and ties to the oil and gas industry.   (Photo by Aaron P. Bernstein/Getty Images)
Aaron P. Bernstein/Getty Images
WASHINGTON, DC - JANUARY 18: Oklahoma Attorney General Scott Pruitt, President-elect Donald Trump's choice to head the Environmental Protection Agency, testifies during his confirmation hearing before the Senate Committee on Environment and Public Works on Capitol Hill January 18, 2017 in Washington, DC. Pruitt is expected to face tough questioning about his stance on climate change and ties to the oil and gas industry. (Photo by Aaron P. Bernstein/Getty Images)
Now playing
02:40
Pruitt target of at least 11 federal probes
 Environmental Protection Agency Administrator Scott Pruitt testifies before the House Energy and Commerce Committee's Environment Subcommittee in the Rayburn House Office Building on Capitol Hill April 26, 2018 in Washington, DC. (Chip Somodevilla/Getty Images)
Chip Somodevilla/Getty Images
Environmental Protection Agency Administrator Scott Pruitt testifies before the House Energy and Commerce Committee's Environment Subcommittee in the Rayburn House Office Building on Capitol Hill April 26, 2018 in Washington, DC. (Chip Somodevilla/Getty Images)
Now playing
02:54
EPA's embattled Pruitt grilled on Capitol Hill
WASHINGTON, DC - NOVEMBER 17:  Environmental Protection Agency Administrator Scott Pruitt leaves after he spoke at an event November 17, 2017 in Washington, DC. Pruitt addressed The Federalist Society's 2017 National Lawyers Convention at the Mayflower Hotel.  (Photo by Alex Wong/Getty Images)
Alex Wong/Getty Images
WASHINGTON, DC - NOVEMBER 17: Environmental Protection Agency Administrator Scott Pruitt leaves after he spoke at an event November 17, 2017 in Washington, DC. Pruitt addressed The Federalist Society's 2017 National Lawyers Convention at the Mayflower Hotel. (Photo by Alex Wong/Getty Images)
Now playing
02:57
Republicans wants answers from EPA chief
(CNN) —  

EPA Administrator Scott Pruitt and his aides have kept “secret” calendars and schedules to overtly hide controversial meetings or calls with industry representatives and others, according to a former EPA official who is expected to soon testify before Congress. A review of EPA documents by CNN found discrepancies between Pruitt’s official calendar and other records.

EPA staffers met routinely in Pruitt’s office to “scrub,” alter or remove from Pruitt’s official calendar numerous records because they might “look bad,” according to Kevin Chmielewski, Pruitt’s former deputy chief of staff for operations, who attended the meetings.

A CNN review which compared Pruitt’s public calendar with internal EPA schedules and emails shows more than two dozen meetings, events or calls were omitted from his public calendar.

Chmielewski said that some interactions were intentionally removed from Pruitt’s calendar after they occurred, such as meetings in June 2017 between Pruitt and Cardinal George Pell, who was charged weeks later with multiple historical charges of sexual offenses. Pell has pleaded not guilty.

“We would have meetings what we were going to take off on the official schedule. We had at one point three different schedules. One of them was one that no one else saw except three or four of us,” Chmielewski told CNN. “It was a secret … and they would decide what to nix from the public calendar.”

Chmielewski says he was forced to leave the EPA in February after raising questions about Pruitt’s spending and management.

If the allegations are true, the practice of keeping secret calendars and altering or deleting records of meetings could violate federal law as either “falsifying records” or hiding public records, according to legal experts interviewed by CNN.

“If somebody changed, deleted, scrubbed a federal record with the intent of deceiving the public or intent of deceiving anybody, it could very well be a violation of federal law,” said Larry Noble, a former general counsel at the Federal Election Commission.

Chmielewski said Pruitt’s aides would print sections of the private calendar containing details of events, gather around a table, sometimes in Pruitt’s office, and decide what would be omitted or altered on the public calendar. He said this often occurred under Pruitt’s direction.

CNN has reached out to EPA repeatedly for comment on the allegations.

Chmielewski’s description of hiding controversial events from the public appears to be supported by discrepancies between Pruitt’s public calendar posted on the EPA’s website and internal schedules, emails and travel itineraries that have been released by the agency in response to public records requests and lawsuits filed by the Sierra Club and Environmental Integrity Project.

While some of the omitted events CNN uncovered consisted of meetings with other government officials – such as a lunch with Kellyanne Conway – others involved meetings with industry executives and attorneys.

For example, Pruitt’s public EPA schedule shows that his final meeting for the day of April 26, 2017, was with Australia’s environmental minister, but an internal calendar shows that later the same day he attended a dinner at the BLT Prime restaurant inside Trump International Hotel hosted by coal producer Alliance Resource Partners and its CEO, Joseph Craft.

Craft, who donated $1 million to President Donald Trump’s inauguration and has given millions more to mostly Republican candidates and committees, has advocated for the rollback of former President Barack Obama’s coal-industry regulations.

While Pruitt’s public calendar notes that he met with former Sen. Trent Lott in September 2017, his internal schedule shows that the meeting also included Anthony Chiarello, the then-CEO of shipping company TOTE. Chiarello and Pruitt discussed TOTE’s ships and their fuel sources, according to documents and a TOTE spokesperson.

Seven of the undisclosed meetings involved individuals who were nominated or reportedly under consideration for EPA positions.

CNN has repeatedly asked EPA officials about the allegations and why the EPA calendar omits some information shown in internal records. The agency has not returned CNN’s messages or calls.

The EPA’s website with Pruitt’s calendar states that it “displays meetings with staff, stakeholders, elected officials, and others outside the Agency.”

Chmielewski said some events were only recorded in a “secret” calendar and have not been made public in documents released by the EPA.

In June 2017, Pruitt took a controversial trip to Italy that cost taxpayers $120,000. While there he dined with Cardinal Pell, a top Vatican official known for denying climate change who was then under investigation for claims of prior sexual offenses.

The dinner never appeared on Pruitt’s official calendar. An EPA spokesperson previously said Pell was one of many at the dinner and that Pruitt was unaware the cardinal was coming there. Chmielewski says that is not true.

“All of our time at the Vatican was spent with Cardinal Pell. Cardinal Pell was basically our host. I mean, that was who we were going to meet with,” Chmielewski said.

He said that in addition to dinner, Pruitt had two additional meetings with Pell that have not been previously reported. One was a lunch with Pell. The other was part of a Vatican tour. Chmielewski said he witnessed Pell greet Pruitt when Pruitt arrived at the Vatican, which is also supported by an internal EPA itinerary that at the time of Pruitt’s arrival states, “Will meet Cardinal Pell.”