United States president Donald Trump suggested Drew Brees caved "under the PR pressure" as he doubled down on his criticism of the New Orleans Saints quarterback.
Earlier this month, Brees issued an apology for comments he made about kneeling during the national anthem, a gesture first made in the NFL by Colin Kaepernick in 2016 when he was protesting racial injustice and police brutality.
The 41-year-old initially said he disagreed with sports stars who take a knee while the anthem is playing, remarks which were made in the wake of the death of George Floyd, who died in police custody in Minneapolis last month, prompting demonstrations across the United States and beyond.
Brees' comments sparked responses of outrage, including from team-mates Michael Thomas and Malcolm Jenkins.
He later asked for forgiveness, saying he "completely missed the mark", an apology that drew condemnation from Trump on Twitter.
Trump, speaking in a video with his son Donald Trump Jr. on the Team Trump YouTube page, delved further into the issue, claiming Brees "hurt himself very badly".
"I was shocked, because I consider him a great football player, but I consider him a champion and a star and I didn't understand what was going on," Trump said.
"And he took it back and I've never seen anything like it and I think he hurt himself very badly.
"I was going to put out that he'll regret that in the future years because you stand for the flag. You have to stand for the flag and the anthem. Our national anthem, you have to stand. I think the NFL's gonna have a lot of problems if they don't."
Trump suggested Brees does not necessarily believe his own apology and merely acted to stem the wave of criticism coming his way.
"A lot of warriors, they cave under PR pressure because his manager said, 'Oh this isn't right', and his team-mates said, 'This isn't right', and all of a sudden he's out there disclaiming about the flag and the country," Trump added.
"I don't believe he believes his second statement, by the way. He may believe it, but what he should be doing is not talking about the second, he should have stuck with his first."