NEW YORK — President Donald Trump was loudly booed at the men's final of the U.S. Open on Sunday, where extra security caused by his visit led to lines long enough that many people missed the start of play, even after organizers delayed it.

Wearing a suit and long, red tie, Trump briefly emerged from his suite about 45 minutes before the match started and heard a mix of boos and cheers from an Arthur Ashe Stadium that was still mostly empty. No announcement proceeded his appearance, and it was brief enough that some in the crowd missed it.

Trump appeared again to more boos before the National Anthem. Standing in salute, the president was shown briefly on the arena's big screens during the anthem, and offered a smirk that briefly made the boos louder.

When the anthem was over, the Republ

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