David Frum spelled out the devastating impact he believes a second term for President Donald Trump could have on the United States in his latest column for The Atlantic.

Frum, who served as a speechwriter in the administration of President George W. Bush, warned in the op-ed titled Last Exit From Autocracy, published Wednesday, that the most important ballot question in the 2020 election was will Trump get away with his corruption.

And if the answer is yes, he wrote, then be ready for more. Much more.

Frum, now a staff writer at The Atlantic, noted that through the Trump years, institutions have failed again and again to check corruption, abuse of power, and even pro-Trump violence.

He listed just some of the damage the president has caused, citing his eschewing of ethics guidelines to welcoming Russian assistance in his election campaign.

Frum also swiped at Trumps enablers in the Republican Party , charging the GOP with thinking of biased rules as necessary, proper, and just and to view any effort to correct those rules as a direct attack on their survival.

Read Frums full column here.