Watch Donald Trump respond to being called a 5-year-old by acting like a 5-year-old.

When Anderson Cooper asked Trump about retweeting an unflattering and sexist picture of his opponent Ted Cruz’s wife, Trump responded by brazenly lying, telling Cooper, “I thought it was a nice picture.” When Cooper called him out on it, Trump said, “He started it,” meaning Cruz. When Cooper told him that was how a 5-year-old would respond, Trump responded by saying, again, “He started it.” Like a 5-year-old would.