Transcript for Lebron James on Trump: 'The people run this country ... damn sure not him'
Today was supposed to be the day when NBA players were asked about the season ahead. It's media day. Instead, they were asked about the president. And among them, Lebron James. Tonight, what he said, and now, the fans in these stadiums, suddenly at odds with one another, taking sides. ABC's senior national correspondent Matt Gutman tonight in Glendale, where the cowboys play the cardinals. Reporter: Tonight, basketball's icon Lebron James knew the questions would not be about the season ahead, but about president trump -- and he was ready. The people run this country. Not one individual, damn sure not him. Reporter: It was Lebron James who this weekend said president trump is now using sports as the platform to try to divide us. He doesn't understand how many kids, no matter their race, look up to the president of the United States. That's what makes me more sick than anything. Reporter: And responding to the president's criticism that those who kneel lack respect for they flag. It is about equality and people having the option and the freedom to speak upon things that they feel that's not just. Reporter: And in addition to football and basketball, the president drawing in NASCAR. We ask you that please rise and remove your hats. Reporter: After the president tweeted, "So proud of NASCAR and its supporters and fans, they won't put up with disrespecting our country or flag," NASCAR royalty, Dale Earnhardt Jr., not buying it, tweeting a quote by John K. Kennedy. Other sports icons weighing in, like Terry brow shadshaw. Fpeople died for that freedom. I'm not sure if our president understands those rights. Reporter: The typical friction between players, owners and league brass melting away. Owners linking arms with players. But the president's words and the protests that followed are also igniting new tensions between fans. I hate you! Boo! Reporter: New England patriots fans booing the team including Tom Brady, as members linked arms. After most of the steelers stayed in the locker room during the national anthem, Jim Heeney burned a mound of steelers fan. I'm a lifelong steelers fan. Not anymore. Reporter: During the campaign, the president made this prediction. The thing that will surprise people, I'll be a unifying. I'm bring people together. That including blacks and whites and everything. Reporter: But tonight, as fans head into the stadium, no matter what side they are, people telling us the president's most recent words are not drawing opposing sides any closer. I feel like it's going to turn into, like, more like white versus black. Matt Gutman with us live tonight, outside the cardinals/cowboys game. The NFL commissioner watching all of this closely. And now responding to the protests, Matt? Reporter: And responding strongly, David. Writing, "The way we reacted this weekend made me proud. Now, oddly enough, it took a controversy of this magnitude, after years of friction, to finally unite the league. David? Matt Gutman with us live tonight. Matt, thank you.
This transcript has been automatically generated and may not be 100% accurate.