The movie, which is set in 1979 and follows the true story about a black police officer who infiltrated the Ku Klux Klan, ends with real footage from the protest in Charlottesville, as well as the president's televised response. But Trump instead chose to say there was "blame on both sides" in the unrest between the neo-Nazi groups and counter-protesters.
Spike Lee said: "And we have a guy in the White House - I'm not gonna say his fucking name - who defined that moment not just for Americans but the world, and that motherfucker was given the chance to say we are about love, not hate".
This seems as though it could be a return to form for Lee, as the award-winning director's most notable works have been cited as culturally impactful and relevant to the struggles that plague the black community in the United States.
Director Spike Lee poses for photographers during a photo call for the film "BlacKkKlansman" at the 71st global film festival, Cannes, southern France, Tuesday, May 15, 2018. He even cultivates a relationship with the Klan's Grand Wizard, David Duke (Topher Grace), who praises Ron's commitment to the advancement of White America.
The film will be released in August on the first anniversary of the Charlottesville conflict.
Having already wrapped the film, Lee added the Charlottesville coda after the unrest in the American summer of a year ago.
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Meanwhile, Liam says that a One Direction reunion could happen in the future. "I'm brutally honest about it", he said. Along with everything else, Liam Pyne also announced the release date for his solo debut album.
The Do the Right Thing filmmaker said he phoned Heyer's mother to personally ask permission to include the shocking footage in his film, which she gave him. She is the mother of Heather Heyer, who got murdered when that vehicle came crashing down the street.
"I was not going to put that murder scene in the film without her blessing", said Lee.
Mr Lee called Charlottesville an "ugly, ugly, ugly blemish on America", but he also repeatedly stressed to the worldwide Cannes media that the racism depicted in BlacKkKlansman is not unique to the United States.
"This Right-wing bullsh-t is not just America, it is all over the world, and we have to wake up". It's all over the world. "She is the mother of Heather Heyer, who got murdered when that vehicle came crashing down the street", Lee said. We can't be silent.
He bounced into the premiere at the Palais announcing: "Brooklyn's in the house!"
He hopes BlacKkKlansman "shakes people from their slumber". And I like to say this is not just something that pertains to the United States of America, this bullshit has gone over the world.