Once the act-like-an-adult sedatives wore off around 30 minutes into the third debate, he lapsed into his reflexive lying and insult comedy. He lied about insulting a disabled reporter. He lied about his past praise of Putin and his call for Japan to pursue nukes. He called his opponent a “nasty woman” and said she shouldn’t be allowed to vote, let alone run for president.

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The most troubling rumble from Trump’s flailing final weeks has been his suggestions that maybe he wouldn’t accept defeat. He teased this riff repeatedly to crowds only to have it be denied by his designated straight man, Mike Pence. But Trump went full wingnut with his comments in the third debate, refusing to say whether he would accept the results of the election if—as the polls show is likely—he loses on Nov. 8.

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By denying that he would accept the results of this election in a presidential debate, Donald Trump delivered perhaps the final insult to our democracy in his disgraceful campaign. The only saving grace is that a true constitutional crisis would require that the election results be close. But less than three weeks from Election Day, he has offered the latest example of why he is deeply unfit to be president of the United States. He has no interest in uniting the nation.

Donald Trump is one of those folks who want to ruin if they cannot rule. In a school yard, he’d be called a spoiled brat. In politics, he’s a dangerous demagogue with a dictatorial streak.