CNN
Now playing
01:22
Rep. Connolly threatens to jail Trump officials
CNN
Now playing
02:02
Barr's answer draws scrutiny amid new scandal
CNN
Now playing
03:32
Watergate journalist: Trump's actions go further than Nixon's
raffensberger
CNN
raffensberger
Now playing
03:25
'This is unacceptable': Election official speaks out after threats against wife
Deep State Dogs
Now playing
03:29
See how internet sleuths are hunting down insurrectionists
Vladimir Putin NBC intv
NBC
Vladimir Putin NBC intv
Now playing
04:22
Hear how Putin compared Donald Trump to Joe Biden
Georgia Secretary of State Brad Raffensperger speaks during a news conference on Wednesday, November 11, 2020, in Atlanta.
Brynn Anderson/AP
Georgia Secretary of State Brad Raffensperger speaks during a news conference on Wednesday, November 11, 2020, in Atlanta.
Now playing
02:35
Family of GA secretary of state got death threats months after election
Pennsylvania State House
Now playing
02:04
Pennsylvania lawmaker to GOP: 'Are you not 100 percent white?'
CNN
Now playing
01:28
'Fishing expedition': Honig slams Trump's DOJ
Getty Images/AP
Now playing
02:08
Trump runs into a problem in revenge quest against GOP governor
CNN
Now playing
02:32
Schiff reacts to DOJ subpoena: Shocked ... but not surprised
CNN
Now playing
04:38
Democratic lawmaker: Trump 'weaponized' DOJ against opponents
WASHINGTON, DC - DECEMBER 09: The Justice Department building on a foggy morning on December 9, 2019 in Washington, DC. It is expected that the Justice Department Inspector General will release his report on the investigation into the Justice and FBIs conduct during the FISA warrant process as it relates to the 2016 election today.(Photo by Samuel Corum/Getty Images)
Samuel Corum/Getty Images
WASHINGTON, DC - DECEMBER 09: The Justice Department building on a foggy morning on December 9, 2019 in Washington, DC. It is expected that the Justice Department Inspector General will release his report on the investigation into the Justice and FBIs conduct during the FISA warrant process as it relates to the 2016 election today.(Photo by Samuel Corum/Getty Images)
Now playing
00:54
Here's the biggest problem Justice Department watchdog faces
CNN
Now playing
03:05
Progressive Democrats grow frustrated with Sen. Sinema
ST IVES, ENGLAND - JUNE 10:  First Lady Jill Biden, wearing a jacket with the phrase "Love" on the back, stands outside the Carbis Bay Hotel on June 10, 2021 in St Ives, England. UK Prime Minister, Boris Johnson, will host leaders from the USA, Japan, Germany, France, Italy and Canada at the G7 Summit which begins on Friday, June 11 2021. (Photo by Toby Melville-WPA Pool/Getty Images)
Toby Melville/WPA/Getty Images
ST IVES, ENGLAND - JUNE 10: First Lady Jill Biden, wearing a jacket with the phrase "Love" on the back, stands outside the Carbis Bay Hotel on June 10, 2021 in St Ives, England. UK Prime Minister, Boris Johnson, will host leaders from the USA, Japan, Germany, France, Italy and Canada at the G7 Summit which begins on Friday, June 11 2021. (Photo by Toby Melville-WPA Pool/Getty Images)
Now playing
02:43
'It's a troll': CNN reporter on Jill Biden's 'love' jacket
WASHINGTON, DC - APRIL 9: Rep. Ilhan Omar (D-MN) speaks during a press conference at Black Lives Matter Plaza calling for an end to U.S. support for a Saudi Arabia-led blockade of Yemen on April 9, 2021 in Washington, DC. 26 year-old Iman Saleh is on her 12th day of a hunger strike for Yemen in Washington, DC. Millions of Yemenis, including children, are on the edge of famine, which some attribute partially to the blockade that has choked the delivery of food and fuel into the country. (Photo by Drew Angerer/Getty Images)
Drew Angerer/Getty Images
WASHINGTON, DC - APRIL 9: Rep. Ilhan Omar (D-MN) speaks during a press conference at Black Lives Matter Plaza calling for an end to U.S. support for a Saudi Arabia-led blockade of Yemen on April 9, 2021 in Washington, DC. 26 year-old Iman Saleh is on her 12th day of a hunger strike for Yemen in Washington, DC. Millions of Yemenis, including children, are on the edge of famine, which some attribute partially to the blockade that has choked the delivery of food and fuel into the country. (Photo by Drew Angerer/Getty Images)
Now playing
03:15
Jewish House Dems condemn Rep. Omar's controversial comments
Washington CNN —  

A Democratic lawmaker on Thursday ratcheted up warnings to the Trump administration amid a growing standoff over subpoenas and oversight requests the White House says it will resist.

Rep. Gerry Connolly threatened jail time for White House officials who are declining to comply with congressional committees’ efforts to conduct oversight of President Donald Trump’s administration. It’s the latest salvo in the escalating battle between the White House and congressional Democrats, who have scaled up their oversight requests following the conclusion of special counsel Robert Mueller’s investigation.

Connolly, who sits on the Oversight Committee, told CNN’s Wolf Blitzer on “The Situation Room,” “We’re going to resist, and if a subpoena is issued and you’re told you must testify, we will back that up.”

RELATED: Trump at war with Democrats: ‘We’re fighting all the subpoenas’

“And we will use any and all power in our command to make sure it’s backed up – whether that’s a contempt citation, whether that’s going to court and getting that citation enforced, whether it’s fines, whether it’s possible incarceration,” the Virginia Democrat added. “We will go to the max to enforce the constitutional role of the legislative branch of government.”

RELATED: House Democrats seek information on Homeland Security departures, Stephen Miller

Trump and administration officials have signaled they will resist the attempts to investigate his policies and personal finances, which has outraged lawmakers and led to accusations he is undermining the constitutional separation of powers.

READ: White House letter that says Stephen Miller won’t testify before Congress on immigration

“We’re fighting all the subpoenas,” Trump said on Wednesday. “These aren’t like impartial people. The Democrats are trying to win 2020. They’re not going to win with the people I see and they’re not going to win against me.”

Three officials have refused to comply with congressional requests to testify at the administration’s urging, ratcheting up the long-brewing battle with House Democrats ready and willing to take their multi-front investigations to the courts.

RELATED: Trump says there was an attempted ‘coup’ on his administration: ‘It’s far bigger than Watergate’

The House Oversight Committee had asked to hear from senior White House adviser Stephen Miller on immigration, former security official Carl Kline on security clearances and Justice Department Principal Deputy Assistant Attorney General John Gore on adding a citizenship question to the US census.

Connolly called the officials’ excuses for failing to appear “an assault on the legislative branch” and “the constitutional framework of our government,” warning that the legislative branch would become “a pale shadow of what it was intended to be” should the officials’ refusals stand.

Connolly said his committee had hoped to learn what Miller “has in his head” given his increasing involvement in the administration’s immigration policies, calling him Trump’s “immigration whisperer” in light of the Department of Homeland Security’s recent leadership changes and the “zero tolerance” policy that resulted in family separations.

RELATED: How Stephen Miller tightened his grip over Trump’s immigration and border policy

“We want to hear from him, what is your thinking, what is it you’ve been advising the President, and where is it you think you’re going to be taking us as a country with these kinds of policies and personnel changes?” he added.