Trump later clarified the talks by saying, "Let's leave it a little bit short of the highest level."
Trump said that he would delete his Twitter account "in a heartbeat if we had a fair press in the US".
Trump also noted that he is seriously considering visiting Poland in September.
Trump's memorandum is based on an investigation under Section 301 of the Trade Act of 1974 into alleged Chinese intellectual property protection and technology transfer practices.
Trump, who is on a two-day visit to the ROK that started on Saturday, extended an impromptu invitation to the DPRK leader on Friday via Twitter to come to the DMZ "just to shake his hand and say Hello". The Associated Press said that Kim accepted Trump's invitation at noon on Sunday.
Trump's latest effort to crack down on immigration follows a measure in April to temporarily suspend immigration to the US, which he said was aimed at protecting US jobs affected by the coronavirus pandemic.
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Trump made the televised address to the nation after a gunman killed more than 50 people and wounded hundreds more when he opened fire on a country music concert in Las Vegas on Sunday.
Trump is charged with abusing the powers of his office by asking Ukraine to investigate a 2020 Democratic political rival, former vice-president Joe Biden, and obstructing a congressional inquiry into his own conduct.
Trump nominated for second term at 2020 Republican National Convention - World - Chinadaily.com.cn
Trump ended his speech by saying the United States is "ready to embrace peace" with all who seek it.