As his presidential candidacy careens toward what increasingly looks like a bitter end on Election Day, Donald Trump is lashing out — at his Democratic opponent, at Republican congressional leaders who belatedly have distanced themselves from him, at the women who have come forward to accuse him of forcing himself on them, and, of course, at the "dishonest and distorted media."

But Trump also is targeting the very political system in which he is competing for the presidency. He is claiming that this election is "rigged" — in the literal sense that the machinery of the electoral process will be manipulated to his disadvantage and that the results will be tainted by fraud. This is dangerous demagoguery, even for Trump.

On Sunday, the Republican nominee tweeted: "The election is absolutely being rigged by the dishonest and distorted media pushing Crooked Hillary — but also at many polling places — SAD." This contradicted the spin offered by his running mate, Indiana Gov. Mike Pence, who as part of his endless exercise in damage control had previously explained that Trump's allegations of "rigging" were actually a reference to media bias.

In the same "Meet the Press" interview, Pence had said: "We will absolutely accept the results of the election." But Trump campaign manager Kellyanne Conway later dialed that back, saying "of course" Trump would accept the voters' will, "absent evidence of wrongdoing, of irregularities and voter fraud."

There is no need to attach such qualifications, because Trump's claim of large-scale voter fraud is preposterous. Trump is casually undermining — and with no evidence — the presumption that elections are fair and that their outcome must be respected by losers and their supporters. That assumption in turn makes possible the peaceful transition of power and respect for the rule of law on which this country long has prided itself.

That respect is the cornerstone not only of a stable democracy, but also a functional one. If people question the legitimacy of an election just because it's won by someone they disagree with, there's little hope of bridging ideological differences and striking the compromises that are an essential part of governing a divided country.

Ignoring such considerations, Trump doubled down in another tweet on Monday: "Of course there is large-scale voter fraud happening on and before Election Day. Why do Republican leaders deny what is going on? So naive!"

This was an echo of Trump's long-standing call for supporters to serve as election "observers" to (as his website puts it) "stop Crooked Hillary from rigging this election!" despite offering no proof that such "rigging" is actually occurring. Instead, he's just recycling the fearmongering about virtually nonexistent election fraud that Republican state officials and lawmakers have increasingly used as a pretext to make it harder for their constituents to cast ballots.

But it gets worse. In campaign appearances in Pennsylvania, Trump has overlaid his absurd allegations of voter fraud with racial insinuations.

At a rally earlier this month in Wilkes-Barre, Pa., Trump said: "We have to make sure the people of Philadelphia are protected, that the vote counts are 100 percent. Everybody wants that, but I hear these horror shows. I hear these horror shows and we have to make sure that this election is not stolen from us and is not taken away from us. And everybody knows what I'm talking about."

FROM AN EDITORIAL IN THE LOS ANGELES TIMES