Over the weekend, President Donald Trump made some very controversial remarks about NFL players who kneel during the national anthem.

“Wouldn’t you love to see one of these NFL owners, when somebody disrespects our flag, to say, ‘Get that son of a bitch off the field right now. Out! He’s fired. He’s fired!’” he told a crowd in Alabama.

“You know, some owner is going to do that. He’s going to say, ‘That guy that disrespects our flag, he’s fired.’ And that owner, they don’t know it [but] they’ll be the most popular person in this country.”

Kneeling during the national anthem was started by American football player Colin Kaepernick back in 2016. The protest was done in support of Black Lives Matter, which campaigns against systematic racism in America.

Thousands march against Donald Trump in LGBT rights parade Show all 8 1 /8 Thousands march against Donald Trump in LGBT rights parade Thousands march against Donald Trump in LGBT rights parade A marcher hold a sign that reads "Love is Love is Love" on the National Mall with the Washington Monument in the background during the Equality March for Unity and Pride in Washington AP Thousands march against Donald Trump in LGBT rights parade Marchers unfurl a huge rainbow flag as they prepare to march in the Equality March for Unity and Pride in Washington AP Thousands march against Donald Trump in LGBT rights parade Marchers gather to hear speakers at the end of the Los Angeles LGBTQ #ResistMarch AP Thousands march against Donald Trump in LGBT rights parade Gil Mendez, of San Francisco, holds a sign to honor the victims of the shooting at the Pulse Nightclub in Orlando as he marches during the Equality March for Unity and Pride in Washington AP Thousands march against Donald Trump in LGBT rights parade An demonstrator looks on as LGBT members and their supporters take part of the Equality March for Unity AFP/Getty Images Thousands march against Donald Trump in LGBT rights parade A marcher listens to speakers at the end of the Los Angeles LGBTQ #ResistMarch AP Thousands march against Donald Trump in LGBT rights parade LGBT members and their supporters take part of the Equality March for Unity AFP/Getty Images Thousands march against Donald Trump in LGBT rights parade A marcher mugs for the camera during the Los Angeles LGBTQ #ResistMarch AP

Numerous celebrities have already criticised the comments, including Stevie Wonder, Harry Potter author JK Rowling, and Oakland baseball player Bruce Maxwell.

Bill Maher was also quick to comment on Trump’s remarks, discussing them with sports broadcaster Bob Costas on his show Real Time.

“Now, I think a guy should be able to not stand for the National Anthem,” Maher said, to which Costas responded: “Even people who disagree with [Kaepernick] recognise that you’d be crazy to deny the right of expression that the people they rightly revere — for having put their lives on the line to protect it and ensure it — why would you deprive someone of that right, even if you disagree with it?”

Maher added: "Trump is consistently awful." Watch below, via EW. The discussion starts around the 6.00 mark.

Costas added how “in effect, the owners collectively have told Colin Kaepernick to get the hell off the field because he doesn’t have a team.”