Robert De Niro, a vocal Trump critic, made a surprise appearance onstage at "Not the White House Correspondents' Dinner" in Washington on Friday.

The actor said he looked forward to the "the exquisite release" of voting the president out of office in 2020, according to People. The Hollywood Reporter says he also described the president as an "unrepentant, lying scum bag."

Robert De Niro has been a vocal critic of the US president. Credit:Evan Agostini

Samantha Bee, comedian and late night host of Full Frontal, wasn't shy about roasting President Trump during the event, either, according to NBC and The Huffington Post.

"I really believe that the current president should have to face someone once a year who calls him on his (expletive)," Bee said at the event. "So Donald, I am going to roast you as if you were here tonight."