GOP infighting escalates -- one week before Trump's impeachment trial

The Republican Party continues to wage an ugly public fight for the future of the party.

On Monday, the Associated Press reported, "Republican Senate leader Mitch McConnell denounced newly elected Rep. Marjorie Taylor Greene on Monday, calling the far-right Georgia Republican's embrace of conspiracy theories and 'loony lies' a 'cancer for the Republican Party.'"

"Somebody who's suggested that perhaps no airplane hit the Pentagon on 9/11, that horrifying school shootings were pre-staged, and that the Clintons crashed JFK Jr.'s airplane is not living in reality," said McConnell, R-Ky. "This has nothing to do with the challenges facing American families or the robust debates on substance that can strengthen our party."

Greene angrily lashed out on Twitter.

"The real cancer for the Republican Party is weak Republicans who only know how to lose gracefully. This is why we are losing our country," she wrote.

Rep. Adam Kinzinger (R-IL) shot back at Greene on Twitter.

The GOP civil war comes one week before the start of his second impeachment trial in the U.S. Senate.