Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE is remaining mum about an upcoming summit between the U.S. and North Korea, referring inquiries on the matter to the White House and the State Department on Sunday.

“I do not want to talk about Korea at all. I will leave it to those who are leading the effort,” Mattis told reporters on Sunday, Reuters reported.

“Because it’s that delicate when you get into a position like this. The potential for misunderstanding remains very high or goes higher," he said.

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“Right now, every word is going to be nuanced and parsed apart across different cultures, at different times of the day, in different context,” Mattis added, according to the news service.

“I’m sure the White House and the Department of State will be keeping you very well informed,” he said.

The White House announced last Thursday that President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE agreed to meet face to face with North Korean leader Kim Jong Un.

Trump said on Saturday that he is looking forward to a fruitful summit with his North Korean counterpart.

"I think North Korea is going to go very well," he said at a campaign rally in Pennsylvania. "I think we will have tremendous success ... they promised they wouldn't be shooting off missiles in the meantime, and they're looking to de-nuke. They're gonna be great."

The White House on Sunday did not rule out a potential meeting at the White House between the two leaders.

"Nothing is being ruled out," deputy White House press secretary Raj Shah said.