U.S. President Donald Trump took a public stance against the use of CIA informants to spy on North Korean leader Kim Jong Un on Tuesday, saying it would not happen on his watch and possibly taking away a valuable tool of the U.S. intelligence community.

Trump's remarks to reporters on the South Lawn of the White House represented a fresh attempt by the president to cozy up to the North Korean leader, a policy that has drawn criticism for seeming to overlook Kim's autocratic rule.

He also spoke of "a beautiful letter" he had received from Kim, but declined to reveal details of the correspondence, saying only that he received it Monday. It was the first public acknowledgment of communication with the North Korean leader since February's second Kim-Trump summit in Hanoi collapsed.