Andrew Card, who served as White House chief of staff during the George W. Bush administration, on Monday expressed support for House Democrats’ impeachment inquiry 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, saying that "clearly lines have been crossed."

"I do think an impeachment inquiry is warranted," Card, who led Bush's White House team between 2001 and 2006, said on MSNBC while addressing revelations about Trump's alleged efforts to enlist Ukraine's help in his 2020 reelection campaign.

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Card cautioned that he wasn't sure if Trump's actions qualified as an "impeachable offense" and implored members of Congress to let the investigation play out before reaching a conclusion on the matter.

"Most people in Congress have already made up their mind when they haven’t seen any evidence. I want people to calm down, take a look at it," he argued. "Don’t call a molehill a mountain. They tend to do that. There’s hyperbole on both sides. This is a serious process."

"I do want the impeachment process if it’s going to go forward to be done deliberately without hyperbole, without exaggeration, based on the facts," he added.

A wave of revelations regarding Trump's interactions with Ukraine prompted 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.) last month to shift her long-held position and launch a formal impeachment inquiry into the president.

A whistleblower complaint filed within the intelligence community is at the center of the probe. The complaint, among other things, accuses Trump of carrying out a broad effort to use "the power of his office to solicit interference from a foreign government in the 2020 U.S. election."

A White House memo of Trump's July 25 call with Ukrainian President Volodymyr Zelensky confirmed several key components of the complaint. During 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 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 Hunter Biden over unfounded allegations of corruption.

Trump and GOP lawmakers have dismissed charges of wrongdoing on the part of the president, suggesting that the impeachment inquiry stems from Democrats' regrets about the 2016 election.

"As I learn more and more each day, I am coming to the conclusion that what is taking place is not an impeachment, it is a COUP," Trump, who has repeatedly lashed out at Democrats over the probe, tweeted last week.