The attorney representing Colin Kaepernick on Thursday condemned NFL owners, alleging that they colluded to keep the former San Francisco 49ers quarterback out of the league in response to President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE's attacks.

"The collusion actually was the NFL kowtowing to the president. I mean it’s clear. I think the evidence will show that," Mark Gerogos said on NBC's "Today," referring to Trump's attacks against players who have kneeled in protest during the national anthem, which was popularized by Kaepernick.

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Geragos acknowledged that no NFL owner will admit to blackballing Kaepernick, but he said that it's apparent the league is actively working to keep him out since Kaepernick remains in "spectacular shape."

"There isn't anyone who has a couple of neurons firing that wouldn't say this isn't collusive activity," Geragos said.

The NFL did not immediately reply to a request for comment from The Hill.

Kaepernick first kneeled during the national anthem in 2016 to protest racial injustice and police brutality. Players from around the NFL have participated in the demonstration in the ensuing years.

But the act became controversial and was repeatedly condemned by Trump. Trump in September 2017 said that NFL owners should fire players for kneeling during the national anthem.

Kaepernick became a free agent when the 2016-17 season concluded and has yet to be signed by an NFL franchise since. He filed a grievance against NFL owners in 2017 and alleged that they colluded to keep him out of the league.

An arbitrator appointed by the league and the players' union ruled last August that the complaint had enough grounds to proceed to a trial.

The ruling meant that NFL owners would likely have to testify about what interactions they've had in regards to Kaepernick's employment in the league.

Geragos's comments came just a day after NFL Commissioner Roger Goodell suggested that Kaepernick would have been signed if a team thought he could help them win.

"The commissioner was roasted appropriately on social media," Geragos said, adding later that "history is going to look kindly" on Kaepernick.