National Basketball Association legend Bill Russell posted a picture of himself kneeling to Twitter, saying he wanted to show his "continued support for the players and their decision to stand up against social injustice".
But the worst part of Trump's bad tweets is the assertion that players are "unable to define" the reasons for their protest. In a series of tweets, the president said players "make a fortune doing what they love" and should not conduct the demonstrations, which began before the 2016 season in protest of social and racial injustice in America. He urged them to "be happy, be cool", and stand during the anthem. Trump suggested the players "find another way to protest". "In order to allow this constructive dialogue to continue, we have come to a standstill agreement on the NFLPA's grievance and on the NFL's anthem policy". All three were among a group of Seattle players who sat during the anthem last season.
The NFL says plans to fine players for anthem protests have been put on hold.
In his most recent tweets, the president also claimed that National Football League players are upset about "something that majority are unable to define".
Thursday night kicked off the first full week of the league's preseason - and controversy has already returned to the game.
Former NFL quarterback Colin Kaepernick tweeted his support for the Miami players.
"As a man, I gotta stand for something", Jaguars linebacker Telvin Smith said after staying in the locker room during the anthem.
U.S. President Donald Trump speaks at a dinner with business leaders at Trump National Golf Club in Bedminster, New Jersey, U.S., August 7, 2018.
Trump is claiming that the players' issues with the justice system are "undefinable" despite the fact that activists' demands are extremely clear and can be distilled in plain-English bullet points.
The NFL added that they "remain committed to working with the players to identify solutions and to continue making progress on important social issues affecting our communities".