Johnny DeppJohnny Depp knew a joke about assassination was going to be "horrible" and "in the press," then went ahead and made the joke anyway.

At the Glastonbury Fest in the UK, where Depp was introducing his 2004 movie "The Libertine," he addressed the crowd asking, "When was the last time an actor assassinated a President?" Of course, the answer to that is "John Wilkes Booth, 1865," but since Depp was already trashing Trump to the crowd, it's clear he wasn't talking about Abraham Lincoln.

And it's not just Twitter reacting to what he said: The Secret Service is aware of Depp's comments. Secret Service staff assistant Shawn Holtzclaw told CNN. "For security reasons, we cannot discuss specifically nor in general terms the means and methods of how we perform our protective responsibilities," a statement from the Secret Service reads.

Depp, who's made headlines in the last year for his financial troubles and messy divorce, first brought up Trump to the crowd, asking, "Can we bring Trump here?"

The crowd booed and yelled," No!"

Depp added, "I think he needs help.... This is going to be in the press, and it will be horrible," he said. He paused briefly and said, "But I like that you're all a part of it."

He then went on to ask, "When was the last time an actor assassinated a President?" The remark was met with cheers and whistles.

Depp then said, "I want to clarify. I'm not an actor. I lie for a living." (Last year, Depp played Trump in a "Funny or Die" spoof called "Presents Donald Trump's The Art of the Deal: The Movie.")

Depp (or his publicist) has yet to comment on the whole thing.

Of course, he's hardly the first celeb to public knock Trump, but, like Kathy Griffin, he's now got the attention of the Secret Service.