An outspoken ally of President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE referred to Trump's potential impeachment as "regicide" in an interview, and accused two whistleblowers who had raised alarms about Trump's conversations with Ukraine's president of being "suicide bombers."

In an appearance on "The Ingraham Angle" on Fox News Tuesday night, Joe diGenova tore into the two unnamed intelligence officials who told the intelligence community's inspector general about their concerns related to Trump's conversations with Ukrainian President Volodymyr Zelensky, calling them agents of the Democratic Party.

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“These two nonentities are suicide bombers that the Democrats have unleashed on the democratic process,” diGenova said. “They actually think that the American people are going to accept having people testify secretly without anyone knowing who they are, where they worked, what their party affiliation was, who they conspired with."

"What you're seeing is regicide; this is regicide by another name: fake impeachment," diGenova added, before claiming, "It’s pretty obvious that this first suicide bomber who sent that complaint to the inspector general was a paid Democratic operative of the Democratic Party."

DiGenova, a former U.S. attorney who has reportedly assisted Trump's efforts to spur investigations into former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE (D), also said during the interview that Democrats' impeachment efforts amounted to a "seditious attack" on the U.S. government.

“The Democrats who used to just love process and procedure and the rule of law, they are literally subverting the law in what really amounts to a seditious attack on the government,” he charged.

The White House escalated its war with Democrats over the impeachment inquiry on Tuesday in a letter sent to House leaders explaining that the administration would fully end its cooperation with Democrats' investigations.

Trump and his allies have argued that a whistleblower who filed a complaint since released to Congress, as well as another The New York Times reported was considering filing a second complaint, are agents of a "deep state" conspiracy working to overturn the results of the 2016 election.

Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) responded, claiming that her party would use the White House's refusal as evidence of obstruction of justice.