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
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MSNBC's Joe ScarboroughCharles (Joe) Joseph ScarboroughMcConnell: 'Over-the-top' Moscow Mitch nickname effort to 'smear' me In three years of Trump's presidency, who has branded whom? GOP group calls on Republican senators to stand up to McConnell on election security in new ads MORE implored Democrats to "roll up their sleeves and go after" President TrumpDonald John TrumpHarris bashes Kavanaugh's 'sham' nomination process, calls for his impeachment after sexual misconduct allegation Celebrating 'Hispanic Heritage Month' in the Age of Trump Let's not play Charlie Brown to Iran's Lucy 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 MuellerFox's Cavuto roasts Trump over criticism of network Mueller report fades from political conversation Trump calls for probe of Obama book deal 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 BrzezinskiMattis: 'I don't know how I could have spoken more loudly' against Trump than by quitting In three years of Trump's presidency, who has branded whom? Brzezinski fires back at Trump after he lashes out at 'Morning Joe': 'I'm sad and disgusted' 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.