April Ryan is going on TV this weekend to explain how and why a reporter was allegedly roughed up by her security this month, but we've learned she's denying responsibility.

Sources close to the White House correspondent and CNN contributor tell TMZ ... April insists that she did NOT give her security the go-ahead to remove, let alone get physical with, New Jersey reporter Charlie Kratovil a few weeks ago at an event she was speaking at.

Unfortunately, it appears that's exactly what went down ... and it got ugly fast.

On August 3, the New Brunswick Today journo told cops that April's bodyguard, Joel Morris, snatched his phone away from him while he was recording April's remarks at the Heldrich Hotel, and then twisted his wrist in an attempt to get him outta there.

April took to social media Saturday, teasing her appearance on CNN Sunday ... where she'll presumably tell her side of the story about the dust-up.

The whole thing was partially captured on Kratovil's smartphone camera, and you can hear what sounds like a physical confrontation. Before that though, you see Kratovil recording April come up to the podium -- where she's addressing some politicos -- but gets interrupted by Morris, whom we're told whispered to her, "Ms. Ryan, stop talking."

She does, giving him a head nod at the same time, and then stands up there silently while her guard walks over to the reporter. It's all downhill from there ... watch.

Our April sources tell us that the reason she stopped talking is because she and her team have a strict policy on people recording her speak in public, to avoid having her words taken out of context. We're told Kratovil was NOT pre-approved to film her here.

It should be noted -- in the police report filed by Kratovil, obtained by TMZ, he told cops he'd been invited to the event by a PR person who wasn't on hand to confirm or deny.

As for why she even has security with her in the first place, well ... she gave us the rundown on that back in November, after she'd received multiple threats on her life.

Anyway, our sources tell us April is doubling down on the fact she didn't sign off on how Kratovil was handled, as she's a huge advocate for First Amendment rights. BTW, Kratovil has a history of filming confrontational encounters for NBT ... it's kinda his thing.

Morris was ultimately booked for assault, harassment and theft, and he'll reportedly be arraigned next month. Either way, we're told he no longer works for April.

We've reached out to Charlie Kratovil for comment ... so far, no word back.