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During last night’s CNN-hosted Republican town hall in Milwaukee there was a funny, and perhaps even cathartic, exchange between Anderson Cooper and Donald Trump over Trump’s hounding of Ted Cruz’s wife, which culminated with Cooper telling Trump he was acting like a child while Trump insisted that he wasn’t acting like a child.

My verdict: Donald Trump was definitely acting like a child. Here is a transcript of their back-and-forth:

Cooper: After saying you were going to spill the beans about Heidi Cruz, you retweeted an unflattering picture of her next to a picture of your wife.

Trump: I thought it was a nice picture of Heidi. I thought it was fine.

Cooper: Come on.

Trump: I thought it was fine. She’s a pretty woman.

Cooper: You’re running for president of the United States.

Trump: Excuse me, excuse me. I didn’t start it. I didn’t start it.

Cooper: But sir, with all due respect: That’s the argument of a five-year-old.

Trump: I didn’t start it—no it’s not.

Cooper: The argument of a five-year-old is: “He started it.”

Trump: Excuse me. You would say that. That’s the problem with our country.

Cooper: Every parent knows a five-year-old who says “he started it.”

Correct! On the subject of whether Donald Trump was behaving in the manner of a small child, there can be no argument. He obviously was, and I think, deep down he probably knows it.

Will Donald Trump’s inability to ever admit he was wrong while also fully accepting blame for the error come back to bite him at some later point in this election? Stay tuned to find out, but you might not like the answer.