US Vice-President Mike Pence has warned North Korea’s Kim Jong-un not to “play” President Donald Trump if they meet next month.
Mr Pence said in a Fox News interview that such a move would be a “great mistake” by the North Korean leader.
Mr Pence also said there was “no question” that Mr Trump could walk away from the 12 June summit.
North Korea has threatened to pull out of the meeting after comments by US National Security Adviser John Bolton.
The country reacted furiously when Mr Bolton suggested it would follow a “Libya model” of denuclearisation.
Libya’s former leader Muammar Gaddafi agreed with Western powers in 2003 to dismantle his programme in return for the lifting of sanctions. Eight years later he was killed at the hands of Western-backed rebels.