Several current and former law enforcement officials said an Obama-era investigation found some evidence that Ms. Omar had entered into a sham marriage with a man suspected of being her brother.

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Long before its baroque décor and class identity became midterm talking points, this durable restaurant chain survived some withering critiques.

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At rallies this weekend, Mr. Obama and Mr. Trump delivered two starkly contrasting pitches, differing in style and substance.

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The 44th president sharply criticized Mr. Trump, who hit back later in the day. Mr. Obama also assailed Vivek Ramaswamy, the Republican nominee for governor of Ohio.

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