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Michelle Obama says that Donald Trump's refusal to say he'd accept Nov. 8 election results if he loses is an insult to millions of Americans who are voting in the presidential election.

She told more than 7,000 supporters of Hillary Clinton in Phoenix that Americans decide elections and Trump was threatening to "ignore our voices and reject the outcome of this election." The first lady said that's the same as "threatening the very idea of America itself."

Mrs. Obama is in Arizona, which has voted for Republican presidential candidates since 1952 -- except for 1996, when it chose Democrat Bill Clinton. Polls show Trump and Clinton running close there with fewer than three weeks until Election Day.

Trump said during Wednesday's debate that he'll keep the nation "in suspense" about whether he'll accept the vote outcome.

Mrs. Obama says: "You don't keep American democracy in suspense."