MSNBC’s Joe Scarborough on Thursday is predicting that 2018 will be the “most consequential political year of our lives.”

In a Washington Post op-ed, the “Morning Joe” host slams President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE for his “anti-democratic” actions in 2017 and warns that a "storm is gathering" next year.

Scarborough writes that Trump's low points included his endorsement of accused sexual predator Roy Moore Roy Stewart MooreRoy Moore sues Alabama over COVID-19 restrictions Vulnerable Senate Democrat urges unity: 'Not about what side of the aisle we're on' Sessions hits back at Trump days ahead of Alabama Senate runoff MORE for an Alabama Senate seat and his statement that there was violence “on both sides” at a white supremacist rally in Charlottesville, Va.

“Others would surely consider the president’s malignant idiocy in foreign affairs to be the most damning legacy of his first year,” Scarborough writes. “World leaders continue to watch dumbstruck as the United States retreats from organizations that were created following the allies’ victory over Hitler. Those same alliances that Trump now undermines with reckless tweets and discarded treaties carried the United States to victory in the Cold War.”

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Scarborough invokes former British Prime Minister Winston Churchill, whose book “The Gathering Storm” warns that “isolationist conceptions” can follow even stable political periods.

Scarborough writes that Churchill’s warnings will be “more relevant to 2018 than at any time since it was written in the years after World War II.”

“While Trump’s eroding of U.S. prestige across the globe is disturbing, it is his administration’s undermining of democratic values that poses an even greater threat to our Constitution and country,” he writes.

“Borrowing again from Churchill, America’s constitutional norms tremble in the balance as Trump unleashes furious attacks on First Amendment protections, independent counsels and law enforcement officers who refuse to be bullied,” Scarborough continues.

“While the framers of the Constitution foresaw the possibility of a tyrannical president, they never let their imaginations be darkened by the possibility of a compliant Congress.”

Scarborough, a former Florida congressman, has been a consistent critic of Trump, and formally left the Republican Party earlier this year.