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"I'm not un-proud of it, to be honest with you," Trump said when asked during the second presidential debate about his recent attacks against former Miss Universe Alicia Machado, whom Trump has criticized for gaining weight.

During Sunday night's debate, when CNN moderator Anderson Cooper asked Trump about his 3 a.m. Twitter attack, Trump brought up Benghazi and the deaths from terrorist attacks there under Clinton's watch as secretary of State.

"When she said 3 o'clock in the morning, take a look at Benghazi," Trump said.

Trump then defended his early morning tweeting as simply an expression of modern communication.

"Tweeting happens to be a modern day form of communication," Trump said. "I mean, you could like it or not like it."