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Video of the exchange, apparently outside an open house at his Simi Valley office, was posted Tuesday on Political Wire. Knight clearly did not appreciate one protester who got in his face.
"If you touch me again, I'll drop your a--, alright?" Knight told him.
The protesters accused Knight of voting for "amnesty" and referenced the recent Homeland Security funding debate. Conservatives insisted the annual legislation to provide money for the agency include provisions undermining President Barack Obama's executive actions that shielded millions from deportation.
However, after Senate Democrats successfully filibustered the bill going after Obama's executive orders, House Republicans, including Knight, relented and passed a so-called "clean" funding bill that did not block the president's executive orders. In his conversation with the protesters, Knight insisted he never voted to support Obama's immigration policy.
"I never voted for amnesty. Never, ever," he told them.
Knight's office told Business Insider that the congressman was on a plane and would be able to provide comment on the incident later.
Watch video of the confrontation below: