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 TrumpAl Gore: Trump has had 'less of an impact on environment so far than I feared' Trump claims tapes of him saying the 'n-word' don't exist Trump wanted to require staffers to get permission before writing books: 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 BarrassoOvernight Energy: Trump EPA to defend Obama smog rule | Wheeler gets warmer welcome before Senate | Animal rights groups sue Interior over pro-hunting council EPA’s Wheeler gets warmer welcome at Senate hearing Trump has no plans to endorse in Tennessee GOP governor's race: report 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: Trump signs 7B defense policy bill into law | Rips McCain hours after signing bill named after him | Green Beret killed in Afghanistan blast US soldier killed by IED in Afghanistan Trump signs 7B annual defense policy bill into law 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.