Hollywood actor George Clooney has strongly criticised US President Donald Trump for threatening to erase "a whole civilization" unless Iran agreed to his terms for a ceasefire deal that was subsequently reached, according to Variety.

Speaking at an event in Cuneo, Italy, Clooney addressed around 3,000 high school students and voiced concern over recent geopolitical tensions. According to Italian news agency ANSA, the actor said, "Some say Donald Trump is fine. But if anyone says he wants to end a civilization, that's a war crime. "