Scarborough implores Democrats: Go hard after Trump or he'll win in 2020

Scarborough implores Democrats: Go hard after Trump or he'll win in 2020
© MSNBC

MSNBC's Joe ScarboroughCharles (Joe) Joseph ScarboroughControversial radio host Don Imus dies at 79 Scarborough: 'Teflon Joe' Biden weathering storm amid Warren's 'political bleeding' Richard Haass to Scarborough: Thursday 'one of Donald Trump's best days as president' MORE implored Democrats to "roll up their sleeves and go after" President TrumpDonald John TrumpTrump rails against impeachment in speech to Texas farmers Trump administration planning to crack down on 'birth tourism': report George Conway on Trump adding Dershowitz, Starr to legal team: 'Hard to see how either could help' MORE and "do whatever it takes to win" — or risk losing the White House again in 2020.

The advice from the former Republican comes one day after former special counsel Robert MuellerRobert (Bob) Swan MuellerSchiff: Trump acquittal in Senate trial would not signal a 'failure' Jeffries blasts Trump for attack on Thunberg at impeachment hearing Live coverage: House Judiciary to vote on impeachment after surprise delay MORE testified before Congress in an appearance that was panned by conservatives and some on the left.

"If you want to stop Donald Trump ... it's time to roll up your sleeves and go after him and do whatever it takes to win. If you don't do that ... you'll have Donald Trump for four more years," said the "Morning Joe" host on Thursday.

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Scarborough left the GOP in 2017 because of his opposition to Trump. The 56-year-old served as a Florida congressman from 1995-2001.

Scarborough, Mika BrzezinskiMika Emilie BrzezinskiBrzezinski on Sanders-Warren: Someone isn't telling the truth Scarborough to GOP: 'What job is worth selling your political soul over?' Mika Brzezinski: Buttigieg's 'age and experience' may explain fade in Iowa poll MORE and Trump were once on better terms during the 2016 Republican primaries, with the former NBC "Apprentice" star in Trump often calling into "Morning Joe" for extended interviews.

But Trump has not appeared on "Morning Joe" or MSNBC since May 2016, shortly before he became the GOP presidential nominee.