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 on Wednesday touted his decision to suspend joint military exercises with South Korea, insisting that the move is well worth it to preserve what he called "good faith" negotiations between the U.S. and North Korea.

"We save a fortune by not doing war games, as long as we are negotiating in good faith – which both sides are!" Trump wrote in a tweet.

We save a fortune by not doing war games, as long as we are negotiating in good faith - which both sides are! — Donald J. Trump (@realDonaldTrump) June 13, 2018

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The tweet came shortly after the president returned to Washington from Singapore, where he had held summit talks with North Korean leader Kim Jong Un and signed a short document reaffirming Pyongyang's commitment to denuclearization in exchange for unspecified security guarantees by the U.S.

Trump also announced on Tuesday that the U.S. would cease its joint military drills with South Korea — an apparent concession to Pyongyang, which has repeatedly claimed that the drills are merely a pretext for a strike on the North.

The South Koreans said early Tuesday that they would seek clarification on the president's remarks, suggesting that they were not aware that Trump planned to offer to give up the drills in his summit with Kim. U.S. military forces in Korea also said they had not received new directions on the exercises.

Questions have been raised about the agreement signed by Trump and Kim on Tuesday, which offers virtually nothing in the way of specifics on how the North plans to dismantle its nuclear arsenal.

Instead, it commits Pyongyang to denuclearization, a promise the North has made — and broken — many times in the past.