Fox News host Chris Wallace said he was told by a well-known GOP source that there is a 1-in-5 chance President Trump will be removed from office if the Senate holds an impeachment trial.

The figure came up during a conversation with acting White House chief of staff Mick Mulvaney on Fox News Sunday as the two discussed the controversies the Trump administration faces related to Ukraine and Syria.

"I talked to a very well-connected Republican in Washington this week, somebody 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 is now a 20% chance he believes — obviously, it's just an estimate — now a 20% chance enough Republicans will vote with the Democrats to remove the president," Wallace said. He did not name the person.

Mulvaney called the prediction "just absurd" and said Wallace's Republican source "clearly doesn't know what they're talking about."

A two-thirds "super majority" of senators present is required to remove the president, should the House approve articles of impeachment by majority vote. Democrats who control the House are conducting an impeachment inquiry, spurred by Trump pressuring Ukraine to investigate political rival Joe Biden.

Twenty Republican senators would need to align with Democrats and two independents who caucus with the Democrats to reach the 67 mark to convict Trump.

Trump's conduct, including a controversial withdrawal of U.S. troops from northern Syria, has upset many of his GOP allies, but Mulvaney dismissed the notion that the president is losing support among his party in Congress.

"No, the president is extraordinarily popular back home, more popular in the swing districts now that impeachment has started," he said.