Colin Kaepernick should have been cut for kneeling during the national anthem, according to a newly uncovered email exchange between former Las Vegas Raiders coach Jon Gruden and ex-GM Bruce Allen of the Washington Football Team.

“They suspend people for taking amino acids, they should cut this f**k,” Gruden wrote in an email to Allen, according to Yahoo Sports.

Kaepernick has not played in the National Football League since 2017, when he opted for free agency.