In September, the actor mocked Trump with talk of a "Game of Thrones"-esque wall on the US northern border because Canadians are "white walkers." At this year's MIT commencement ceremony, Damon expressed a fascination for a theory that states we are living in a simulated reality created by more intelligent forms of life. He then asked: "If there are multiple simulations, how come we have to be in the one where Donald Trump becomes the Republican nominee for president? Can we, like, transfer to a different one?"