Tom Hanks says Donald Trump will be president “when spaceships come down filled with dinosaurs in red capes.”

Speaking to Sky News on the red carpet at the London premiere of his new movie, A Hologram for the King, Hanks also took issue with Trump’s central campaign slogan, “Make America Great Again.”

“America’s already great so I don’t know what he is talking about,” said the Oscar-winning actor. Hanks, like many of his fellow Hollywood actors, is backing Hillary Clinton’s campaign. He joined Kim Kardashian, Kanye West, Jessica Alba and more for a Clinton fundraiser last year.

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Write to Charlotte Alter at charlotte.alter@time.com.