Sen. Jeff Flake (R-AZ) apologized on Wednesday after BuzzFeed discovered that his high school-aged son had used racist and homophobic language on the Internet.

Screen grabs obtained by BuzzFeed showed that Flake’s son, Tanner, had called one person on Twitter a “Jew” and repeatedly used the term “faggot.”

“To the faggot who stole me dirt bike from the church parking lot, I will find you, and I will beat the crap out of you,” he wrote.

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A video game screen shot posted in another tweet revealed that Flake’s son had used the online name “n1ggerkiller” on the social gaming app “Fun Run.”

“I’m very disappointed in my teenage son’s words, and I sincerely apologize for the insensitivity,” Flake told BuzzFeed in a statement. “This language is unacceptable, anywhere. Needless to say, I’ve already spoken with him about this, he has apologized, and I apologize as well.”

A Public Policy Polling survey earlier this year determined that Flake was the one of the most unpopular senators in the country after he voted against expanding gun background checks in the wake of the Sandy Hook Elementary School massacre.

“Nothing like waking up to a poll saying you’re the nation’s least popular senator,” he wrote in a Facebook post following the poll. “Given the public’s dim view of Congress in general, that probably puts me somewhere just below pond scum.”