Donald Trump 's presence was known at the US Open .

The president, 79, attended the men’s singles final at the Billie Jean King Center in New York on Sunday, Sept. 7, when he was met with a mix of boos and cheers.

Trump stepped away from where he was situated in the Rolex box to wave to those also in attendance at around 1:40 p.m. local time, which prompted the crowd reaction.

He then waved quickly once more, before stepping back inside. The match, which was scheduled to begin at 2:00 p.m., was delayed.

TV stations broadcasting the US Open were previously told not to air any boos or cheers for Trump as he attended. The United States Tennis Association (USTA), which hosts the event, told broadcasters to "refrain from showcasing any disruptions or reactions in response to the Presiden

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