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PHILADELPHIA (CBS/CNN) —  In another round of fighting NFL policy, the NFL Player’s Association filed a grievance on Tuesday challenging the NFL’s new policy on player protests during the pre-game national anthem, saying the rule infringes on player rights.

“The union’s claim is that this new policy, imposed by the NFL’s governing body without consultation with the NFLPA, is inconsistent with the collective bargaining agreement and infringes on player rights,” the NFLPA said in a statement.

HOUSTON, TX – DECEMBER 10: Several San Francisco 49ers take a knee during the National Anthem before the game against the Houston Texans at NRG Stadium on December 10, 2017 in Houston, Texas. (Photo by Bob Levey/Getty Images)

“In advance of our filing today, we proposed to the NFL to begin confidential discussions with the NFLPA Executive Committee to find a solution to this issue instead of immediately proceeding with litigation. The NFL has agreed to proceed with those discussions and we look forward to starting them soon.”

The grievance comes more than a month after the NFL issued a new policy requiring that all team personnel on the field “shall stand and show respect for the flag and the Anthem.” Players who decide not to stand for the anthem are allowed to stay in the locker room, the policy said. If any team personnel do kneel, the team will be fined.

NFL Commissioner Roger Goodell responded to President Trump’s criticism of players kneeling in protest during the national anthem. Goodell called the comments “divisive” and said they show a “lack of respect” for the league and its players.

The NFL policy was an attempt to put to rest the ongoing debate over protests during the national anthem, which have pulled the NFL into a divisive cultural battle.

“We want people to be respectful to the National Anthem,” NFL commissioner Roger Goodell said. “We want people to stand, that’s all personnel, and make sure that they treat this moment in a respectful fashion that’s something I think we owe. We’ve been very sensitive in making sure that we give players choices, but we do believe that that moment is an important moment and one that we are going to focus on.”

GLENDALE, AZ – SEPTEMBER 25: Members of the Dallas Cowboys link arms before the National Anthem at the start of the NFL game against the Arizona Cardinals at the University of Phoenix Stadium on September 25, 2017 in Glendale, Arizona. (Photo by Christian Petersen/Getty Images)

The NFL did not consult players before issuing the new rule, and the NFLPA said at the time it would review the policy.

The debate was first sparked when quarterback Colin Kaepernick decided to kneel during the pre-game anthem in 2016 as a protest against racial injustice. But critics saw the protests as unpatriotic and disrespectful of the American flag and the US military.

The issue came to a head when President Donald Trump said in September 2017 that NFL owners should tell protesting players, “Get that son of a bitch off the field right now, he’s fired. He’s fired!”

SANTA CLARA, CA – SEPTEMBER 12: Colin Kaepernick #7 and Eric Reid #35 of the San Francisco 49ers kneel in protest during the national anthem prior to playing the Los Angeles Rams in their NFL game at Levi’s Stadium on September 12, 2016 in Santa Clara, California. (Photo by Ezra Shaw/Getty Images)

The epithet caused many more players to kneel during the anthem and turned the most popular sports league in America into a partisan talking point.

Kaepernick has not been hired by any NFL team since he became a free agent last year, and he has filed a grievance against the NFL, saying team owners colluded to deny him a job because of the protests.

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