President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE said Thursday that NBA Hall of Famer Dennis Rodman was not invited to attend his upcoming summit with North Korean leader Kim Jong Un.

“I like him. He’s a nice guy. No, he was not invited,” Trump told reporters during a meeting with Japanese Prime Minister Shinzo Abe.

Trump added that he did not know about Rodman’s intention to be in Singapore during the upcoming summit with Kim.

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Rodman, who has developed a friendship with Kim and has made multiple visits to North Korea, reportedly plans to visit Singapore while the summit is taking place.

Rodman also previously appeared as a contestant on Trump's reality television show "Celebrity Apprentice."

Trump is slated to meet with Kim next Tuesday at a luxury hotel in Singapore. The meeting will convene at 9 a.m. local time, which is 9 p.m. EDT.

Trump told reporters Thursday he does not have to prepare “very much” for his high-stakes summit with Kim because he believes “it’s about attitude.”

“I think I'm very well prepared,” Trump said. “I don't think I have to prepare very much. It's about attitude. It's about willingness to get things done.”

The U.S. is pushing for North Korea to fully abandon its nuclear program.