Trump has also instructed current and former members of his administration not to testify or produce documents, leading senior officials like Secretary of State Mike Pompeo to defy House subpoenas. Democrats say that behavior constitutes obstruction of Congress, forming the basis of the other impeachment charge.
Trump canceled the planned June 12 summit in Singapore on Thursday, citing Pyongyang's recent "open hostility". However, he reversed course the next day, saying the summit could still go ahead after productive talks.
Trudeau said returning children to school safely is critical to restarting the economy since it would allow parents to return to work without stressing about the health of their children.
Trump also said he promised to raise with Kim the subject of Japanese citizens abducted by DPRK, after Abe focused on the issue during their meeting early in the day.
Trump has pursued a series of legal challenges in numerous states, although none has thus far resulted in any meaningful gains for the president. Most of the lawsuits have been rejected by judges, who have expressed skepticism about the claim that the election results are illegitimate.
Trump said he would speak with Canadian Prime Minister Justin Trudeau in a little while and hoped to resume negotiations with Canada soon.
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Trump signed a presidential memorandum toughening US policy toward Cuba. It prohibits US companies from doing business with firms associated with Cuba's military, and restricts US citizens from traveling to the Caribbean nation.
Tsai's refusal to recognize the one-China principle caused increasing hostility among people across the Straits, he said.
Trump's trip coincides with the last week of Theresa May's premiership, before she steps down as Prime Minister at the end of the week and in a repeat of events on his visit to the UK last year, Trump has already given a newspaper interview extolling the virtues of Brexit-supporting former Foreign Secretary Boris Johnson as a potential leader.
Trump made the remarks during his meeting with visiting Chinese State Councilor Yang Jiechi in the Oval Office of the White House.