MSNBC's Scarborough hits back at Trump: 'History will be kind' to Romney

MSNBC host Joe ScarboroughCharles (Joe) Joseph ScarboroughBiden to CBS reporter: 'Why, why, why, why, why?' Controversial radio host Don Imus dies at 79 Scarborough: 'Teflon Joe' Biden weathering storm amid Warren's 'political bleeding' MORE came to the defense of Sen. Mitt RomneyWillard (Mitt) Mitt RomneyDemocrats step up pressure over witnesses after Bolton bombshell Kaine: GOP senators should 'at least' treat Trump trial with seriousness of traffic court Des Moines Register endorses Elizabeth Warren as Democratic presidential nominee MORE (R-Utah) on Saturday after President TrumpDonald John TrumpTrump denies telling Bolton Ukraine aid was tied to investigations Former senior Senate GOP aide says Republicans should call witnesses Title, release date revealed for Bolton memoir 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." 

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 BidenJoe BidenTrump denies telling Bolton Ukraine aid was tied to investigations Former senior Senate GOP aide says Republicans should call witnesses Title, release date revealed for Bolton memoir 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!"