Christopher Ruddy, CEO of the conservative news organization Newsmax and a longtime confidant 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, said Tuesday that the House's formal impeachment inquiry is a "mortal threat" to Trump's presidency.

"I believe it’s a mortal threat to his presidency. He certainly should treat it that way," Ruddy, who said that he spoke to Trump after 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.) announced the inquiry last month, said on CNN.

The Newsmax CEO justified his stance by noting the growing public support for impeachment, pointing to recent polls that show a majority of Americans endorsing an inquiry into the president.

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"The number of people saying the president should be impeached is increasing. Not significantly, but it’s moving in a bad direction for the president. So I do think it should be treated very seriously," Ruddy said, before arguing that Trump did not commit a crime in his dealings with Ukraine.

A wave of revelations regarding Trump's interactions with Ukrainian President Volodymyr Zelensky led Pelosi to shift her long-standing position last month and announce a formal impeachment inquiry.

A whistleblower complaint filed within the intelligence community is at the center of a group of House committees' investigation.

The complaint accuses Trump of a broad effort to pressure Ukraine into investigating 2020 presidential candidate 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 and his son over unfounded allegations of corruption.

A White House memo confirms key components of the complaint that focus on the president's July 25 phone call with Zelensky. In the call, Trump asked Zelensky to work with his personal attorney Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE and Attorney General William Barr Bill BarrFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Why a backdoor to encrypted data is detrimental to cybersecurity and data integrity FBI official who worked with Mueller raised doubts about Russia investigation MORE to investigate the former vice president and his son Hunter.

Trump and several GOP lawmakers have dismisses charges of wrongdoing, asserting that the impeachment inquiry is an attempt to undo the 2016 election.

On Tuesday, White House counsel Pat Cipollone told Pelosi and three Democratic committee leaders that the Trump administration would refuse to cooperate with the impeachment inquiry. The move will likely invite a constitutional clash between the president and the lower chamber of Congress.