President Donald Trump criticized multiple aspects of the NFL during an Alabama rally Friday night, including claiming penalties for hard hits are bad for the game.

But he also took a shot at Colin Kaepernick and his national anthem protests — which inspired several other players to follow suit — and said players who protest should be fired.

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

The former San Francisco 49ers quarterback’s mom, Teresa Kaepernick, responded to Trump’s remarks about her son with some sass.

Kaepernick’s parents have been supportive of him for standing up for what he believes in and fighting against racial injustice and police brutality. In a statement to The Undefeated in December, they debunked the theory that they don’t support their son, saying: