Bolton said that Washington fully supports efforts by the Japanese Prime Minister to meet with Kim without any preconditions, the New York Times reported.
According to him, the President already had "two unconditional meetings with Kim Jong-un" in Singapore and Hanoi and that he did not see "anything untoward" in Abe pursuing a similar meeting with the North Korean leader.
Bolton said the US had not heard much from North Korea since the Vietnam summit in February, which ended abruptly after Trump rejected Kim's suggestion that Washingtonlift the most painful of sanctions imposed on his country since 2016 in exchange for a partial dismantlement of its nuclear weapons programme.
"We really have not heard much from North Korea since the Hanoi summit," he said, adding that US officials were "ready to have further discussions at the working level to see what progress might be made".
The US National Security Advisor said that Trump's special envoy for North Korea Stephen Biegun, "can't wait to talk to his North Korean counterpart but they have not responded".
"He is ready at any point to get on a plane and go anywhere to talk to them," he added.
During his Japan visit, Trump will hold meetings with Abe starting Sunday and meet Emperor Naruhito on Monday.
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