Not the first time a Republican has threatened a reporter:
cbsnews.com
Representative Michael Grimm after Obama’s 2014 State-of-the-Union address. (more at the link)

He then walked away, and Scotto said, “So Congressman Michael Grimm does not want to talk about some of the allegations concerning his campaign finances. We wanted to get him on camera on that but he, as you saw, refused to talk about that. Back to you.”

With the camera still rolling, Scotto suddenly looks up, clearly startled.

“What?” Scotto asks.

And Grimm, again on-camera, though off-mike, can be heard speaking to Scotto in a low voice.

Grimm says, “Let me be clear to you, you ever do that to me again I’ll throw you off this f——-g balcony.”