Fox's Chris Wallace Christopher (Chris) WallaceHouse to vote on resolution affirming peaceful transition of power Gayle King calls out Pelosi for calling Trump supporters 'henchmen': 'Egregious language' GOP lawmakers distance themselves from Trump comments on transfer of power MORE said a "well-connected" Washington Republican told him that there's a 20 percent chance enough Republicans will vote to remove 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 from office in an impeachment trial in the Senate.

Wallace mentioned his source's comments during an interview with acting White House chief of staff Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE on "Fox News Sunday."

Wallace cited an overwhelming House vote criticizing the president's policies in Syria and an op-ed by Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellDemocratic senator to party: 'A little message discipline wouldn't kill us' House to vote on resolution affirming peaceful transition of power Republican lawyers brush off Trump's election comments MORE (R-Ky.) slamming Trump's decision to withdraw troops from that country.

He then said he had "talked to a very well-connected Republican in Washington, someone whose name you would know well, who says that if the House votes to impeach and it gets to a trial in the Senate, there's now a 20 percent chance enough Republicans would vote with Democrats to impeach the president."

The Fox anchor then asked Mulvaney if he was concerned about the president losing GOP support.

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"That’s just absurd," Mulvaney said. "The comment about the 20 percent is just a person who clearly doesn't know what they're talking about."

The acting chief of staff added that Trump knew his decision to withdraw troops from Syria would be controversial and wouldn't be "politically popular."

"The president is extraordinarily popular at home," Mulvaney said, emphasizing his likability in swing states.

When Wallace said he was referring to GOP lawmakers distancing themselves from the president, Mulvaney responded, "They have to go home eventually as well."

Mick Mulvaney reacts to GOP criticism of the President's Syria playbook: "He (the President) recognizes the fact that it is not politically popular in this town to make the decision that he made to move troops out of Syria" Check your local listings. #FNS pic.twitter.com/lhtSl9NWv6 — FoxNewsSunday (@FoxNewsSunday) October 20, 2019

Trump decided earlier this month to remove troops from Syria, which led to a Turkish invasion of northern Syria.

The decision sparked bipartisan backlash, with Republicans saying it had stabbed Kurdish allies now fighting with Turkey in the back while giving new leverage to ISIS, Russia and the government of Syrian President Bashar Assad.

Polls have indicated support for impeachment has grown since 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 an inquiry last month, with multiple polls over the past two weeks showing that a majority of respondents supported the impeachment of Trump.

But it's still considered highly unlikely that many Republicans would back Trump's impeachment.