Demanding not only an organization-wide protest against the NFL for not "disciplining" the players, Trump also declared that all owners immediately fire any player who wouldn't stand for the national anthem.
The protest has its origin in the actions of players like Colin Kaepernick, former quarter back with the San Francisco 49ers (and now without a team), who first refused to stand for the anthem 13 months ago in protest against perceived police brutality against, and the oppression of, black people in the US.
"The players aren't subject to any prosecution, but if they take a provocative act, they can expect to be condemned", he said.
"But while Dallas dropped to its knees as a team, they all stood up for our National Anthem", Trump wrote.
Trump returned to the issue September 26, proposing that the league institute a regulation prohibiting the protest.
Trump has tweeted more than 20 times about the National Football League since Friday.
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Former NFL tight end Shannon Sharpe recently said, "That's what got the owners".
It all started on Friday, Sept. 22, when President Donald Trump told a rally in Alabama, "Wouldn't you love to see one of these National Football League owners, when somebody disrespects our flag, to say, 'Get that son of a b-- off the field right now. Out".
Former San Francisco 49ers quarterback Colin Kaepernick first kneeled during the national anthem previous year, refusing to stand to protest police shootings of unarmed African-Americans. "Players will stand for Country!" He is not playing this season after he was not signed as a free agent.
Trump says that when players kneel during the anthem "they're not respecting our country".
Kaepernick has not yet commented on how his movement has taken off within the NFL.
Trump said players who protest should be "suspended or fired", and called them "sons of b*tches" in comments made during an Alabama rally and posted to Twitter. He said the front office came to the players with suggestions on how to proceed, and they asked the players for their own suggestions as well.
Lee also argued that Trump has no right to get involved with the players' right to freedom of speech.