“This contrast gives the president a chance to expand his support closer to 50 percent,” Mr. Nunberg insisted.
But on Sunday, Democrats said Mr. Trump was diving into an issue on which he has a shaky standing.
“He has no moral authority to be talking about 9/11 at all,” Representative Jerrold Nadler, Democrat of New York, said on CNN’s “State of the Union” on Sunday. Mr. Nadler noted that Mr. Trump’s real estate company applied for and received grants after the attacks that were intended for small businesses affected by the devastation.
Mr. Nadler said he thought Ms. Omar’s comments about the Sept. 11 attacks were being taken out of context.
“I have had some problems with some of her other remarks, but not with that one,” Mr. Nadler said.
The controversy arose from Ms. Omar’s remarks at an event last month sponsored by the Council on American-Islamic Relations, an advocacy organization, where she focused on attacks against Muslims after Sept. 11. She said she had “lived with the discomfort of being a second-class citizen and, frankly, I’m tired of it, and every single Muslim in this country should be tired of it.”
“CAIR was founded after 9/11 because they recognized that some people did something and that all of us were starting to lose access to our civil liberties,” she said. (The organization was actually founded in 1994.)
Critics of Ms. Omar contended that the words “some people did something” were dismissive of the terrorist attacks, but her defenders said her words were taken out of context.
The attack was not Mr. Trump’s first on Ms. Omar. Despite repeatedly being denounced for not making forceful condemnations of white nationalists who traffic in anti-Semitism, the president pounced when Ms. Omar unleashed a firestorm in February with her comments on Israel, rejecting her subsequent apology and calling for her to resign.