Seattle Seahawks star Richard Sherman called President Trump’s behavior “unacceptable” after Trump attacked NFL players who kneel during the national anthem.

“The behavior of the President is unacceptable and needs to be addressed. If you do not Condemn this divisive Rhetoric you are Condoning it!!” Sherman tweeted Saturday.

The behavior of the President is unacceptable and needs to be addressed. If you do not Condemn this divisive Rhetoric you are Condoning it!! — Richard Sherman (@RSherman_25) September 23, 2017

Sherman is one of many NFL players criticizing Trump after he hit at players who kneel during the national anthem during a campaign rally Friday night.

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Trump told the crowd they should leave in protest if they see a player kneeling during the anthem.

"When people like yourselves turn on television and you see those people taking the knee when they are playing our great national anthem – the only thing you could do better is if you see it, even if it's one player, leave the stadium," Trump said. "I guarantee things will stop."

Trump doubled down on his comments in a pair of tweets Saturday, saying NFL players who protest the flag or anthem "should find something else to do."