MSNBC co-host Joe Scarborough says he only left the Republican Party because the abandoned its beliefs.

"I did not leave the Republican Party. The Republican Party left its senses," Scarborough wrote in an op-ed published Sunday evening.

Last week, the former conservative congressman from Florida declared he was leaving the GOP to become an independent.

"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."

Scarborough lambasted congressional Republicans for going along with Trump and not stating differences of opinion.

"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.' Republican leaders were silent," Scarborough wrote. "And as the commander in chief insulted allies while embracing autocratic thugs, Republicans who spent a decade supporting wars of choice remained quiet. Meanwhile, their budget-busting proposals demonstrate a fiscal recklessness very much in line with the Bush years."

He called the GOP "a dying party that I can no longer defend."

"Political historians will one day view Donald Trump as a historical anomaly. But the wreckage visited of this man 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," Scarborough predicted.