Transcript for Backlash grows against Trump's statements on protests in sports
not urging fans to boycott the NFL. Tom? Sending a mixed message. Mary, thank you. And Oakland a's rookie Bruce Maxwell, becoming the first major league baseball player taking a knee during the anthem. Outrage is building over the president's heated comments. Here's Ryan Smith. Reporter: Tonight, growing backlash across the country. I hate you! Reporter: Fans in Philadelphia clash over the controversy ignited by president trump. The NFL uniting. I guess we're all a son of a . Reporter: Former head coach Rex Ryan campaigned for trump, but had harsh words today. I'm pissed off, I'll be honest with you. Because I supported Donald Trump. Calling our players S.O.B.S and all that kind of stuff. That's not the men that I know. The men that I know in the locker room I'm proud of. Reporter: Hall of fame quarterback Terry Bradshaw disagrees with the protest, but stands behind the protesters' right to do it. If our country stands for anything, folks, what, it's freedom. People died for that freedom. I'm not sure if our president understands those rights. Reporter: Owners from six teams taking the field during the anthem in support of their players. Half of them making statements in solidarity. Patriots owner Bob Kraft is a well known friend of trump, even flying on air force one, donating $1 million to his inaugural committee. But today saying he's, "Deeply disappointed by the tone of the comments" and "There is no greater unifier in this country than sports. Unfortunately, nothing more divisive than politics." We spoke to fans across the country and that divide is clear. I stand for those who stand for us. You guys make a lot of money, and they should stand during the national anthem. I voted for president trump, but there are other issues he should be more concerned with. We agree with standing up for the flag. Reporter: The take a knee hashtag tweeted roughly 2 million times. Tonight I'm taking a knee for America. Reporter: Singer Stevie wonder and his son kneeling at the global citizens concert last night. Oakland a's baseball player Bruce Maxwell showing his support. And tonight, the NFL will play this ad in primetime showing how football can unify. Inside these lines, we may have our differences, but recognize there's more that unites us. Ryan joins us from outside MetLife stadium. I know you're talking to your sources in the NFL. Are they saying this is only the beginning of the protests? Reporter: Emotions were running high among many players, and fans were generally supportive of the protests on Sunday. That means there could be more
This transcript has been automatically generated and may not be 100% accurate.