The summit took place in Hanoi on Feb. 27 and 28.
Mr Trump’s national security adviser, John Bolton, said on Tuesday that the United States would look at ramping up sanctions on North Korea if Pyongyang did not scrap its nuclear weapons program.
Mr Bolton told Fox Business Network that following the Hanoi summit, Washington would see whether Pyongyang was committed to giving up its “nuclear weapons programme and everything associated with it.”
“If they’re not willing to do it, then I think President Trump has been very clear … they’re not going to get relief from the crushing economic sanctions that have been imposed on them and we’ll look at ramping those sanctions up in fact,” said Bolton, a hardliner who has advocated a tough approach to North Korea in the past.
Mr Trump told a news conference after an unprecedented first summit with Kim on June 12 in Singapore that the North Korean leader had promised that a major missile engine testing site would be destroyed very soon.
Mr Trump did not identify the site, but a US official subsequently told Reuters it was the Sohae Satellite Launching Ground, which is located at Tongchang-ri.
Asked to comment, the White House referred to the US State Department, which did not immediately respond.