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Trump calls into Senate GOP lunch to discuss North Korea

Trump calls into Senate GOP lunch to discuss North Korea
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President TrumpDonald John TrumpTrump to fundraise for 3 Republicans running for open seats: report Trump to nominate former Monsanto exec to top Interior position White House aides hadn’t heard of Trump's new tax cut: report MORE called into the Senate GOP lunch from Air Force One on Tuesday to discuss North Korea, according to a senator who attended the gathering.

Trump's call to the closed-door GOP lunch held at the National Republican Senatorial Committee (NRSC) came hours after his historic summit with North Korean leader Kim Jong Un in Singapore.

"We just got off the phone with the president of the United States from Air Force One on his plane back from Singapore. He sounded confident and upbeat, as he should," Sen. John BarrassoJohn Anthony BarrassoWhy grizzly bear hunting season isn’t happening Trump poised to sign bipartisan water infrastructure bill Dems to force health care vote weeks before Nov. midterms MORE (R-Wyo.) told reporters after the caucus lunch.

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Trump's call to the Senate GOP meeting comes after he and Kim signed a document committing the United States to unspecified “security guarantees” in exchange for a denuclearized Korean Peninsula.

The document did not elaborate on specific steps the U.S. will take to guarantee North Korea's security, nor did it offer terms for how Pyongyang would move to denuclearize.

Trump also announced that the U.S. would suspend joint military exercises with South Korea, which raised eyebrows among some Republicans. A Pentagon spokeswoman said that Defense Secretary James MattisJames Norman MattisOvernight Defense: Pentagon insists Mattis, Trump 'completely aligned' on leaving arms treaty | Trump 'not satisfied' with Saudi explanation on Khashoggi | Kushner says US still 'fact-finding' A solid budget requires tradeoffs Pentagon: Trump, Mattis 'completely aligned' on Russia arms treaty withdrawal MORE had been consulted on the announcement.

Vice President Pence will separately brief House Republican leaders on Tuesday’s historic summit between Trump and Kim, a GOP aide told The Hill.