Conservative radio host Glenn Beck is under federal investigation over a comment he made on his radio show while talking about Donald Trump.

Mr. Beck insists that his comment about stabbing the GOP front-runner was not directed at Mr. Trump, but the Secret Service has said it is conducting a follow-up investigation, CBS reported.

During his radio show Friday Mr. Beck and his producers were discussing the 2016 race and the GOP candidates saying they would support Mr. Trump is he became the nominee.

His producers mocked Mr. Beck after he mentioned being in the shoes of Mr. Trump’s rivals.

“Was it gigantic shoes?” asked his producer Stu Burguiere, CBS reported.

“If I was close enough and I had a knife. Really. I mean the stabbing just wouldn’t stop,” Mr. Beck responded, appearing to direct the comment at Mr. Burguiere.

That conversation was later reported saying that Mr. Beck had threatened Mr. Trump.

In a post on Facebook, Mr. Burguiere wrote, “It was reported that Glenn had threatened to stab a presidential candidate this morning which was off since I was on the show with him and didn’t notice anything like that. … Of course, if you were listening, you know that Glenn actually threatened me, not Donald Trump, so I am in the off situation of defending my boss for threatening my life.”

This is not the first time the Secret Service has responded to an alleged death threat against Mr. Trump. An Egyptian flight student was recently arrested after he wrote a Facebook post saying he would consider serving a life sentence if he could kill Mr. Trump.

The State Department has since pulled Emadeldin Elsayed’s visa. He is currently being held in a Southern California jail. He has said he would voluntarily return home instead of being deported.

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