The mother of former San Francisco 49ers quarterback Colin Kaepernick is standing by her son after President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE blasted NFL players who take a knee during the national anthem.

At a fiery campaign rally in Huntsville, Ala., on Friday, Trump took aim at professional athletes who kneel in protest when the national anthem is sung at sporting events, saying that players that do so should be fired and urging fans to leave the games.

"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,' " Trump said.

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The comment was an implicit swipe at Kaepernick, the current NFL free agent who gained notoriety last year for taking a knee during the national anthem to protest police misconduct and social injustice.

Kaepernick's mother, Teresa Kaepernick, fired back after Trump's remarks.

"Guess that makes me a proud bitch!" she wrote on Twitter Friday.

Guess that makes me a proud bitch! — Teresa Kaepernick (@B4IleaveU) September 23, 2017

Teresa Kaepernick's tweet was first reported by USA Today's "For the Win" blog.

The president's comments Friday night weren't his first concerning Kaepernick. Earlier this year, he suggested that Kaepernick had become a free agent because of his high-profile protests, which spurred other athletes to launch similar acts of defiance.