Players for the Miami Dolphins could be suspended for up to four games if they participate in national anthem protests under a new team policy.

The decree was issued in a “Proper Anthem Conduct” section included in the Dolphins recently released nine-page discipline document, according to The Associated Press.

In the document, an anthem protest is listed under “conduct detrimental to the team,” and could lead to paid or unpaid suspension, a fine or a combination of both.

A source close to the team told the Miami Herald that they had to have a policy in place before reporting to training camp.

The decision comes after the NFL decided in May that teams would be fined if their players don’t stand during “The Star-Spangled Banner.”

President Trump turned the issue into a political and social tinderbox last year when he said owners should “Get that son of a bitch off the field” if they protest the anthem.

In 2018, a number of NFL players were suspended four games for violation of the league’s performance-enhancing drug policy.