MSNBC host Joe Scarborough is blasting the Republican Party over its support of President Trump, calling the GOP “a dying party I can no longer defend.”

Scarborough, a former GOP lawmaker from Florida who announced last week that he is leaving the party, said in a Washington Post op-ed published late Sunday that Republicans who are working with Trump are “making the majority of Americans regret” voting for the party.

“The political movement that once stood athwart history resisting bloated government and military adventurism has been reduced to an amalgam of talk-radio resentments,” Scarborough wrote. “President Trump’s Republicans have devolved into a party without a cause, dominated by a leader hopelessly ill-informed about the basics of conservatism, U.S. history and the Constitution.”

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The “Morning Joe” co-host slammed Republicans for not criticizing Trump’s policies and standing by the president instead of championing party values that voters want to see enacted in Washington.

“The GOP president questioned America’s constitutional system of checks and balances. Republican leaders said nothing. He echoed Stalin and Mao by calling the free press ‘the enemy of the people,’” Scarborough wrote. “Republican leaders were silent. And as the commander in chief insulted allies while embracing autocratic thugs, Republicans who spent a decade supporting wars of choice remained quiet.”

“Last week’s Russia revelations show just how shamelessly Republican lawmakers will stand by a longtime Democrat who switched parties after the promotion of a racist theory about Barack Obama Barack Hussein ObamaMomentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina Majority of voters say Trump should not nominate a Supreme Court justice: poll MORE gave him standing in Lincoln’s once-proud party,” Scarborough continued. “Neither Lincoln, William Buckley nor Ronald Reagan would recognize this movement.”

He also warned that Trump will “break the Republican Party into pieces — and lead to the election of independent thinkers no longer tethered to the tired dogmas of the polarized past.”

“When that day mercifully arrives, the two-party duopoly that has strangled American politics for almost two centuries will finally come to an end,” Scarborough wrote. “And Washington just may begin to work again.”

Trump frequently appeared on Scarborough's show in the past, leading to criticism about him being too close to the then-candidate, but that relationship has since soured. Trump has regularly attacked the show on Twitter and last month went after co-host Mika Brzezinski's appearence, saying she arrived at his Mar-a-Lago resort "bleeding badly from a face-lift."

Brzezinski and Scarborough shot back at Trump, accusing the White House of attempting to blackmail them with a tabloid story.