Trump warns CNN's Acosta before taking question: 'Be nice. Be respectful'

President TrumpDonald John TrumpTrump knocks BuzzFeed over Cohen report, points to Russia dossier DNC says it was targeted by Russian hackers after fall midterms BuzzFeed stands by Cohen report: Mueller should 'make clear what he's disputing' MORE warned CNN's Jim Acosta on Tuesday "be nice" and "be respectful" when asking a question during a news conference following his summit meeting in Singapore with North Korean leader Kim Jong Un.

"Go ahead. Be nice. Be respectful," Trump said after calling on Acosta.

"I'll be very respectful, sir. What did Kim Jong Un say to you to give you the confidence that for once in the history of North Korea they are not cheating the system and gaming the world and gaming the people who will have to go in and make sure they are giving up their nuclear arsenal?"

"Very fair question," Trump responded.

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"He mentioned the fact they proceeded down the path in the past and nothing got done. In one case, they took billions of dollars during the Clinton regime. Took billions of dollars and nothing happened," he continued.

"He brought it up to me. He said we have never gotten this far. I don’t think they have ever had the confidence in a president they have right now for getting things done and ability to get things done. He was very firm in the fact that he wants to do this — I think he might want to do this as much or even more than me," Trump added.

"Because they see a bright future for North Korea. You never know. We never know. We signed a comprehensive document today. I think most of you have been given that document. We signed a very, very comprehensive document and I believe he will live up to that document."

Trump and Kim signed an agreement earlier Tuesday committing the U.S. to unspecified "security guarantees" in exchange for the eventual denuclearization of the Korean peninsula.

Trump and Acosta once infamously jousted in a New York press conference when CNN's chief White House correspondent made several attempts to ask a question to the president-elect.

"Your organization is terrible," Trump said to Acosta on Jan. 12, 2017.

"You're attacking us. Can you give us a question?” Acosta shot back.

"Don't be rude. No, I'm not going to give you a question. You are fake news," Trump responded before moving on to another question.

Trump has not appeared on CNN since August 2016, when Anderson Cooper conducted an interview with him over the phone.

The president on Tuesday sat down with ABC's George Stephanopoulos for his first major broadcast interview outside of Fox News and Fox Business in 15 months.

Trump also did an interview in Singapore with Fox News's Sean Hannity, a staunch supporter of the president.