Donald J. Trump has attracted enormous attention for his proposal to temporarily bar Muslims from entering the United States. But on Monday he said he was "happy" that London had elected its first Muslim mayor and suggested that the new official would be among the exceptions to his proposal.

"There will always be exceptions," Mr. Trump said when asked in an interview on Monday how his proposed ban would affect London's mayor, Sadiq Khan.

"I was happy to see that," Mr. Trump said of Mr. Khan's election. "I think it's a very good thing, and I hope he does a very good job because frankly that would be very, very good."

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