A freshman Republican congressman was caught on video threatening to knock out a conservative protester during a demonstration outside his office last week.

A video featured Monday at SantaClarita.com showed Rep. Steve Knight (R-CA) threatening the man, who was part of an anti-immigration protest organized by the conservative group Save Our State.

“You told me you didn’t vote for amnesty and you did. I looked it up on the Internet,” the man said as he shook the congressman’s hand. “You lied to me.”

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“Mike, if you touch me again, I’ll drop your ass,” Knight replied after the man slapped him on the shoulder.

The man backed anyway, and protested that he had only shaken the congressman’s hand.

“One more time, Mike,” Knight, who was formerly an officer with the Los Angeles Police Department, shot back. “Understand, I never voted for amnesty.”

In a statement about the incident on the Save Our State discussion forum, the group called for Knight to apologize for his behavior.

“When a Congressman tells a private Citizen that he’s ‘going to drop your ass’, while surrounded by his security agents that are most probably armed. That is not only abusive it also crosses a dangerous line. I think it’s fair to say that Steve Knight has some anger issues, and quite possibly a screw loose.”

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Watch the video below: