And the 'Spotlight star has revealed following the announcement of the new US leader on Wednesday, he is against the "hate Trump elicits".
Mark tweeted: "This is what we were out protesting tonight. It's the hate Trump elicits from his followers. #TrumpProtest (sic)."
However, Mark isn't the only one to be in support of the protests as music legends Madonna and Cher have also revealed they are backing campaigns against Donald.
The Like a Virgin hitmaker took to social media to share a video of mass protests taking place to her Instagram account, which sees "rebels unite".
She wrote: "Need to Turn these Words into Action..........So Now What? ?????? Rebel Unite. N.Y.C. Start A Revolution of (sic)."
Whilst Cher has revealed she was disturbed by "loud" protesters whilst in her New York hotel but when she realised what the commotion was about she swiftly went outside to hug "many" of those involved and praise them for fighting against the 70-year-old businessman.
She said: "Walked out hotel & in2,NEW YORKERS!! THEY WERE LOUD & PROUD‼ THAT AMERICANS HAVE RIGHT 2YELL HOW THEY FEEL‼ Hugged many.. THEY HAVE SPIRIT (sic)."
Meanwhile the If I Could Turn Back Time hitmaker believes the world will "never" be the same again following Donald's success, and has slammed the former Apprentice mogul as a "petty, vengeful coward" and a "toilet".
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Speaking before the result was announced, she posted a series of tweets asking people of colour to vote for Hillary, saying how proud her 90 year old mother was of Hillary, and trying to make sure America did not make the same mistake as Britain with Brexit.
