NFL players have even helped fund their new team.
"I'm upset [franchise owners] the Rooneys didn't want to participate in the national anthem, so to me they're anti-American," the man said, explaining his Nazi flag.
The president used a video of the Jamaican sprinter from 2012 to add to the NFL debate.
"Not only is he a racist but he's a racist with untreated mental illness. So under diff circumstances he's Dylann Roof."
Rico Lavelle, who took a knee after singing the national anthem on Sunday in Detroit, said President Donald Trump's profane criticism of NFL players who silently protest is un-American.
While some applauded Linsey, a former finalist on "The Voice" in Season 8, for showing solidarity with protesters for social equality, many in the country music singer's fan base were not pleased.
President Donald Trump said he was respecting the flag and American veterans when he decried NFL players who take a knee during the national anthem to protest, but more and more veterans are telling the president he's wrong.
'If nothing else what he's done is he's generated more conversation around some topics that need to be talked about,' president says of national anthem protest.
The left-wing Labour leader chose not to sing 'God Save The Queen' at a service on Tuesday.
The theme of this year's New York City Veterans Day Parade honors The Star Spangled Banner's 200th anniversary.