Trump said Thursday afternoon in Hanoi at a press briefing that the main impediment to a deal was Kim's requirement that the United States lift sanctions against Pyongyang "in their entirety" in exchange for denuclearizing a "large portion" of the DPRK's nuclear program, which was not acceptable by the United States.
Trump forced out Sessions as head of the Justice Department last November after repeatedly criticizing his decision to recuse himself from the Russia probe.
Trump has frequently suggested he views the Justice Department less as a law enforcement agency and more as a department that is supposed to do his personal and political bidding. Still, investigators are never supposed to take into account the political affiliations of the people they investigate.
Trump's trip is her first big solo international tour as US first lady that included Ghana, Malawi, Kenya and Egypt.
Tria held meetings with Chinese Finance Minister Liu Kun last week, termed the discussions "very fruitful", and highlighted the need for enhancing mutual dialogue and establishing more structured methodology to evaluate mutual understanding of both sides' policies.
Trump's pardon of Manafort, who was at the heart of an investigation by special prosecutor Robert Mueller into allegations of Russian interference in the election four years ago, triggered fury that Trump was trying to erase the probe he has always described as a "witch hunt". Moscow denies any claims of interference.
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Trump also blasted unfair trade deals and accused the world of taking advantage of Washington on trade.
Trump agreed last month to the summit with the DPRK leader but with no specific dates or venue set. He said on Monday that he expected to meet Kim in May or early June.
Trump played down the development, tweeting on Saturday night that "I do not know" the envoy and it's a "nothing event". He noted McGurk planned to leave soon anyway and added: "Grandstander?"
Trump is talking about raising the tax on automobiles and auto parts to 20 or 25 percent.