“You must have a Democrat mayor?” Mr. Trump asked, leaning toward the edge of the stage to survey crowdgoers as he waited for the protesters to clear out. “Do you have a Democrat mayor?”
Still, Mr. Trump’s fans expressed unbridled enthusiasm for him despite — or perhaps because of — the various altercations he provokes in Washington. They came wearing the traditional red “Make America Great Again” baseball caps and waved preprinted signs like “Jobs! Jobs! Jobs!” and “Women for Trump.”
Many were watching to see if his supporters repeated the “Send her back” chant of his last rally, in North Carolina, calling for the expulsion of Representative Ilhan Omar, Democrat of Minnesota, who came to the United States as a Somali refugee and was naturalized as a citizen while a teenager. Mr. Trump sent mixed signals in the hours before the rally about whether they should do that.
“I can’t tell you whether or not they’re going to do that chant. If they do the chant, we’ll have to see what happens,” he told reporters before leaving the White House. At the rally, Mr. Trump stayed away from attacking Ms. Omar, instead focusing on the broad threat of Democratic policies, and the chant did not arise.
He did pause to attack Senator Elizabeth Warren of Massachusetts, who was hailed this week for her willingness at the debates to forcefully defend her ideas in a crowded Democratic field, for claiming Native American ancestry.
“I have more Indian blood than she does,” Mr. Trump said, “and I have none — I’m sorry.”
Before the rally, Mr. Trump appeared preoccupied with the performance of the Democratic candidates in the debates, offering his assessment as he left the White House.
“I think that Kamala did not do well last night,” he told reporters, referring to Senator Kamala Harris of California. “I think Biden did O.K. He came through. He came limping through, as I say about Sleepy Joe. He limped right through it. But he got through it. He really did. I think he was O.K.”