MSNBC host Joe Scarborough Charles (Joe) Joseph ScarboroughScarborough calls on Cuomo to walk back statement he made about Trump: 'Out of bounds' Mika Brzezinski: 'Super grossed out' by Trump speech attendees 'who put their lives at risk' Democrats tear into Trump's 'deep state' tweet: His 'lies and recklessness' have 'killed people' MORE came to the defense of Sen. Mitt Romney Willard (Mitt) Mitt RomneyCrenshaw looms large as Democrats look to flip Texas House seat The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election Trump dumbfounds GOP with latest unforced error MORE (R-Utah) on Saturday after 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 lashed out at the GOP senator and called him a "pompous 'ass.'"

"Mitt is a winner in so many ways that you will never be," Scarborough, a vocal Trump critic and host of MSNBC's "Morning Joe," tweeted in response to Trump.

The former Republican congressman argued that "history will be kind" to Romney, the GOP's 2012 presidential nominee, adding, "You? Not so much."

Mitt is a winner in so many ways that you will never be. Also, history will be kind to Senator Romney. You? Not so much. You’ll forever be remembered as the man who made James Buchanan the second worst president in American history.

Congrats. https://t.co/RVK69UDrQk — Joe Scarborough (@JoeNBC) October 5, 2019

Trump went after Romney on Saturday morning after the GOP senator spoke out against the president's public encouragement of China and Ukraine to look into former Vice President 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.

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Romney called Trump's behavior "wrong and appalling."

The Utah senator is one of the few Republican lawmakers who have openly expressed concern or outright criticism about Trump's dealings with Ukraine.

Romney spoke out last month about Trump's call with the leader of Ukraine in which the president urged the foreign government to investigate Biden.

The senator called details of the conversation "deeply troubling" after the White House released a rough transcript of the call.

Trump issued two tweets about Romney on Saturday morning, mocking him for his 2012 electoral defeat while noting that he declined to pick him for secretary of State.

In the first tweet, Trump told Romney to "wake up." In the second, he wrote that "Mitt Romney never knew how to win."

"He is a pompous 'ass' who has been fighting me from the beginning, except when he begged me for my endorsement for his Senate run (I gave it to him), and when he begged me to be Secretary of State (I didn’t give it to him)," Trump continued. "He is so bad for R’s!"