Donald Trump has resumed his attack on the NFL protest movement, saying the Oakland Raiders running back Marshawn Lynch should be suspended after he sat for the national anthem.

The Raiders played the New England Patriots in Mexico City on Sunday and stood for the Mexican national anthem. He remained standing for the opening of the Star-Spangled Banner before sitting down.

“Marshawn Lynch of the NFL’s Oakland Raiders stands for the Mexican Anthem and sits down to boos for our National Anthem,” tweeted Trump on Monday morning. “Great disrespect! Next time NFL should suspend him for remainder of season. Attendance and ratings way down.”

Marshawn Lynch of the NFL’s Oakland Raiders stands for the Mexican Anthem and sits down to boos for our National Anthem. Great disrespect! Next time NFL should suspend him for remainder of season. Attendance and ratings way down. — Donald J. Trump (@realDonaldTrump) November 20, 2017

The anthem protest movement was started last season by Colin Kaepernick to highlight racial injustice in the United States. Lynch came out of retirement this season and is yet to stand for the anthem, although he has not said why. However, last month he wore an t-shirt that read “Everybody vs Trump”. Trump prompted large numbers of players to protest earlier this season after saying any player who kneels for the anthem should be fired. Only a small number of players are still kneeling during the anthem – apart from Lynch four other players knelt during the Star-Spangled Banner on Sunday. There are 32 teams in the NFL, and 46 players on each roster are eligible to l

It is highly unlikely that the NFL would – or even could – suspend Lynch as there is no rule forcing players to stand for the anthem. TV ratings are, however, down this season although the same is true for sports across America including Nascar. Stadium attendances have held steady although the NFL takes into account season tickets in attendance figures, even if fans do not show up.

Trump’s tweet is likely to play well with his base - an ESPN survey showed the majority of white Americans oppose the protests. The same survey showed most African Americans approve.

The president was involved in another sports story on Sunday. After intervening to secure the release of three UCLA basketball players held for shoplifting in China, Trump said he wished he had left them in jail. He was apparently incensed after one of the player’s fathers questioned how big a part Trump had played in their release. All three players had thanked Trump for his help.