Former U.S. President Donald Trump lashed out at Senate Minority Leader Mitch McConnell on Tuesday, signaling a growing feud between the two most senior Republican voices after the party lost the White House and control of the Senate.

"Mitch is a dour, sullen, and unsmiling political hack, and if Republican Senators are going to stay with him, they will not win again," Trump said in a statement just three days after McConnell excoriated him following the former president's second impeachment trial, on a charge of inciting the deadly attack on the U.S. Capitol.

Trump and McConnell parted ways in the weeks after the Nov. 3 presidential election, with Trump irked that McConnell had recognized Democrat Joe Biden as the winner in mid-December. They have not spoken since, a former White House official said.