PHOTO: Mark Wilson/Getty Images

Interior Secretary Ryan Zinke, speaks during the unveiling of "Prescribed to Death" a Memorial to the victims of the opioid crisis, temporally located on the Ellipse at PresidentÕs Park, on April 11, 2018 in Washington, DC. (Mark Wilson/Getty Images)

Now playing

02:39

Sources: Interior secretary under investigation

PHOTO: CNN

Now playing

03:04

Avlon: Pence's op-ed is 'way worse than Stockholm syndrome'

PHOTO: CNN

Now playing

01:35

See what security looks like outside US Capitol

PHOTO: Gov. Cuomo's office

Now playing

03:35

Gov. Andrew Cuomo addresses women's allegations

PHOTO: Gov. Cuomo's Office

Cuomo

Now playing

00:56

Cuomo says he has no plans to resign

Now playing

04:51

Elected Republican who supports Biden's bill speaks out

PHOTO: Alex Brandon/AP

President Joe Biden speaks during a meeting about cancer in the Oval Office of the White House, Wednesday, March 3, 2021, in Washington. (AP Photo/Alex Brandon)

Now playing

01:20

'Neanderthal thinking': Biden on states lifting mask restrictions

PHOTO: CNN/Getty

Now playing

02:10

'Highly misleading at best': Dale reacts to Pence's op-ed

PHOTO: GREG NASH/POOL/AFP via Getty Images

Commanding General District of Columbia National Guard Major General William J. Walker testifies before the Senate Homeland Security and Governmental Affairs/Rules and Administration hearing to examine the January 6, 2021 attack on the US Capitol on Capitol Hill on March 3, 2021 in Washington, DC. (Photo by Greg Nash / POOL / AFP) (Photo by GREG NASH/POOL/AFP via Getty Images)

Now playing

03:01

DC National Guard commander: 'Unusual' Pentagon restrictions slowed response to Capitol riot

PHOTO: MANDEL NGAN/POOL/AFP via Getty Images

FBI Director Christopher Wray testifies before the Senate Judiciary Committee on the January 6th insurrection, in the Hart Senate Office Building on Capitol Hill in Washington, DC on March 2, 2021. (Photo by MANDEL NGAN / POOL / AFP) (Photo by MANDEL NGAN/POOL/AFP via Getty Images)

Now playing

02:55

Watch FBI director debunk conspiracy theories pushed by Trump supporters

PHOTO: CNN

abrams

Now playing

00:51

Abrams on voting rights: We're fighting to protect our democracy from domestic enemies

PHOTO: Joe Raedle/Getty Images

Goya Foods President Robert Unanue speaks at a press conference with Carlos Vecchio, the Venezuelan Ambassador who is recognized by the United States on December 21, 2020 in Doral, Florida. The two held the press conference to discuss details of a recent shipment of humanitarian aid to Venezuela, donated by Goya Foods. (Photo by Joe Raedle/Getty Images)

Now playing

03:24

Goya CEO under fire for false Trump election claims

PHOTO: CNN

Rep. Adam Kinzinger (R-IL) speaks to CNN's Alisyn Camerota about why he thinks that the Republican Party will move on from former President Donald Trump.

Now playing

02:03

Kinzinger: Trump is a loser and we will move on

Now playing

04:17

NYC mayor says Gov. Cuomo should resign if allegations are true

PHOTO: Jeenah Moon/Getty Images

NEW YORK, NY - JULY 23: New York Gov. Andrew Cuomo speaks during the daily media briefing at the Office of the Governor of the State of New York on July 23, 2020 in New York City. The Governor said the state liquor authority has suspended 27 bar and restaurant alcohol licenses for violations of social distancing rules as public officials try to keep the coronavirus outbreak under control. (Photo by Jeenah Moon/Getty Images)

Now playing

02:29

NYT: Third woman comes forward against Gov. Andrew Cuomo

PHOTO: Sarah Silbiger/Getty Images North America/Getty Images

WASHINGTON, DC - MAY 25: U.S. President Donald Trump and first lady Melania Trump depart the White House for Baltimore, Maryland on May 25, 2020 in Washington, DC. The Trumps will attend a Memorial Day ceremony at the Fort McHenry National Monument and Historic Shrine despite objections by Baltimore Mayor Bernard C. "Jack" Young, whose residents remain under a stay-at-home order due to the coronavirus. (Photo by Sarah Silbiger/Getty Images)

Now playing

02:10

Trump got vaccinated in secret. Here's why this matters

(CNN) —

The Justice Department is investigating Interior Secretary Ryan Zinke for possibly using his office for personal gain, following a referral from Interior’s inspector general, two sources familiar with the investigation say.

The full extent of the inquiry is unclear.

Zinke has faced multiple ethics questions during his time at Interior, and the inspector general’s office has multiple public inquiries into the secretary including the department’s handling of a Connecticut casino project, whether the boundaries for Grand Staircase Escalante National Monument were redrawn to benefit a state lawmaker and conversations between Zinke and Halliburton Chairman David Lesar about a Montana land development project.

Zinke said he has not been contacted by the Justice Department.

“They haven’t talked to me. It will be the same thing as all the other investigations. I follow all rules, procedures, regulations and most importantly the law. This is another politically driven investigation that has no merit,” Zinke told CNN.

The Justice Department declined to comment. Interior’s inspector general’s office said it would not comment on Justice-related issues.

President Donald Trump’s Cabinet secretaries have faced scrutiny over their use of government resources, including former Health and Human Services Secretary Tom Price and Housing and Urban Development Secretary Ben Carson.

01:41 - Source: CNN

Zinke claims to be geologist, again

PHOTO: George Frey/Getty Images

KANAB, UT - MAY 10: U.S. Secretary of the Interior Ryan Zinke talks to reporters before departing Kanab Airport on May 10, 2017 in Kanab, Utah. Zinke has been in the state of Utah since Sunday talking with state and local officials and touring the Bears Ears National Monument and Grand Staircase-Escalante National Monument, to help determine their future status under the Trump Administration. (Photo by George Frey/Getty Images)

Now playing

01:41

Zinke claims to be geologist, again

PHOTO: Mark Wilson/Getty Images

WASHINGTON, DC - JUNE 20: Interior Secretary Ryan Zinke testifies during a Senate Energy and Natural Resources Committee hearing on Capitol Hill, on June 20, 2017 in Washington, DC. The committee heard testimony on U.S. President Donald Trump's proposed FY2018 budget request for the Interior Department. (Photo by Mark Wilson/Getty Images)

Now playing

02:45

Zinke kept some meetings off public calendar

PHOTO: cnn

menendez ebof

Now playing

01:44

Menendez: Zinke on path to 'white' department

PHOTO: Mark Wilson/Getty Images

Interior Secretary Ryan Zinke delivers a speech billed as "A Vision for American Energy Dominance" at the Heritage Foundation on September 29, 2017 in Washington, DC.

Now playing

01:04

Sources: Zinke tells employees diversity isn't important

Zinke Konnichiwa Colleen Hanabusa sot_00021110.jpg

Now playing

02:35

Zinke says 'Konnichiwa' after hearing WWII story

PHOTO: CNN

david jolly

Now playing

00:58

Jolly: No accountability in this administration

PHOTO: Andrew Harnik/AP

Interior Secretary Ryan Zinke, left, kisses his wife Lolita Hand after Vice President Mike Pence, right, administers the oath of office, Wednesday, March 1, 2017, in the Eisenhower Executive Office Building on the White House complex in Washington.

Now playing

02:08

Questions surround Zinke's wife's travel

PHOTO: Mark Wilson/Getty

Interior Secretary Ryan Zinke walks up to deliver a speech on September 29 in Washington, DC.

Now playing

02:21

Trump Cabinet member flies his own flag

PHOTO: Mark Wilson/Getty Images

Interior Secretary Ryan Zinke delivers a speech billed as "A Vision for American Energy Dominance" at the Heritage Foundation on September 29, 2017 in Washington, DC.

Now playing

03:11

Interior secretary's trips may have violated law

alaska izembek road zinke griffin pkg _00022204.jpg

Now playing

07:35

Another environmental reversal under Trump (2017)

PHOTO: Tom Williams/CQ Roll Call/Getty Images

Dan Sullivan, Republican senate candidate from Alaska, is interviewed in Roll Call's Washington office, June 4, 2014. (Photo By Tom Williams/CQ Roll Call)

Now playing

01:11

GOP senator: Trump official threatened my state

PHOTO: JIM WATSON/AFP/Getty Images

US Congressman Ryan Zinke, R-Montana, is sworn in before testifying before Senate Committee on Energy and Natural Resources on Capitol Hill in Washington, DC, January 17, 2017, on his nomination to be Secretary of the Interior in the Trump administration. / AFP / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)

Now playing

01:11

Ryan Zinke confirmed as interior secretary

trump ryan zinke sexual harassment interior secretary confirmation hearing bts_00004811.jpg

Now playing