While campaigning for Alabama Senate runoff candidate, President Donald Trump reportedly went on a tangent in which he referred to former San Francisco 49ers quarterback Colin Kaepernick as a “son of a b*tch.”

“‘Wouldn’t you like to see one of our NFL owners, when somebody disrespects the flag, say, ‘Get that son of a b*tch off the field,'” Trump reportedly said at the rally. Kaepernick is not currently employed by any NFL football teams, as he was not drafted after his controversial bended-knee protests during the National Anthem last year.

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Pres. Trump discusses kneeling during national anthem at football game: “That’s a total disrespect of our heritage” https://t.co/PYcZWSvN5I — NBC News (@NBCNews) September 23, 2017

Immediately, Twitter took Trump to task over his language and behavior.

“When was the last time a sitting President said ‘son of a b*tch‘ on purpose at a rally?” activist-journalist Shaun King tweeted. “Has that ever happened?”

“Trump used harsher language to describe Kaepernick than he used for the Neo-Nazi who killed Heather Heyer,” another user tweeted in response.

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Read more of the shocked and angry reactions below.

Trump was quicker and more vehement in his hatred of Colin Kaepernick’s non-violent protest than he was of Nazis. Take note of that. — Anthony F. Irwin (@AnthonyIrwinLA) September 23, 2017

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Trump litigating the Kaepernick protest. Crowd chants U-S-A. — Alexander Nazaryan (@alexnazaryan) September 23, 2017

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Crowd chants "U-S-A! U-S-A!" Trump just mainlined some racist heroin into the Huntsville crowd by tacitly calling Colin Kaepernick a SOB — The Hoarse Whisperer (@HoarseWisperer) September 23, 2017

Wrote in March about how Trump's vocal obsession w/@Kaepernick7 opens Trump up to be sued for contract interference https://t.co/H9cPzevPFg https://t.co/EMy4Bqwawk — Dave Zirin (@EdgeofSports) September 23, 2017

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https://twitter.com/JohnRBielski/status/911394836804235264

Trump calls Colin Kaepernick a "son of a bitch" & rejected the invite to the NAACP convention, but he's not racist? — Laurie Crosswell (@lauriecrosswell) September 23, 2017

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https://twitter.com/MattZeitlin/status/911392486144094208