Trump, who is expected to make an appearance on each of the four nights at the RNC, will deliver an acceptance speech on Thursday night from the White House South Lawn.
Trump offered condolences and thanked first responders, but he stayed out of public sight. He later described his visit as "warm and wonderful" and released pictures and video with nurses, doctors and patients. Trump was later scheduled to travel to El Paso.
Trump triggered widespread concern about a trade war between the world's two largest economies when he signed a memorandum on Thursday to impose tariffs on up to billion in imports from China under a Section 301 case on China's intellectual property policies and practices.
Trump confirmed last week that Pompeo met with Kim earlier this month via Twitter, tweeting that the "meeting went very smoothly and a good relationship was formed."
Trump's action, critics and nonpartisan experts said, marked an unprecedented politicization of the federal government's security clearance process. It also was a clear escalation in Trump's battle with members of the US intelligence community as the investigation into Russia election meddling and possible collusion and obstruction of justice continues.
Trump has repeatedly attacked the Mueller probe as a "rigged witch hunt."
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Trump had recently called Iran a "rogue" state, which has aroused fierce response from the Iranian government.
Trump was right that nations cannot remain bystanders given the common threats and challenges the world faces today, but cooperation cannot be shared self-interest, since for his administration that means a shared commitment to what is in the short-term interests of the US, rather than what is in the best long-term interests of all countries.
Trump told Zelenskiy: "I heard you had a prosecutor who was very good and he was shut down and that's really unfair."
Trump, who is scheduled to make a statement at 11 am EDT (1500 GMT), on Twitter called the agreement with the United States' northern neighbor "wonderful" and "a historic transaction."