Former President Barack Obama had cast his successor as out of touch while jabbing at his extravagant sense of style. Mr. Trump responded at length.

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The president visited Sioux City, part of deep-red Western Iowa, in an effort to boost GOP turnout in a state that was once solidly Republican.

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The incidents, the first of which was reported on Thursday, came as election officials have reported a growing number of threats directed at them.

© Tierney L. Cross for The New York Times

Paolo Zampolli, a longtime Trump associate, gained attention earlier this year with a report that his ex-wife had been detained by ICE after his request.

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