Trump praised the role China and President Xi Jinping have played.
Trump recognized Warsaw's decision to purchase 32 F-35 fighter jets. A US F-35 fighter conducted a flyover of the White House right before the joint news conference began.
Trump again encouraged people to wear masks. He said it was up to the governors to decide how strongly to encourage or require face coverings in their states. Trump has worn a mask once in public, but this week started encouraging face coverings on a wider scale.
Troy Stangarone, senior director of congressional affairs and trade at the Washington-based non-profit Korea Economic Institute, said that "real progress on these issues will take time, both in terms of building the trust and confidence between the United States and North Korea to be successful, but also in terms of working through the mechanics of denuclearization."
Tucker denied that Flint was opposed to new cost cutting plans, which HSBC revealed on Monday would result in up to 4,700 job cuts, or 2 percent of its 237,685-strong global workforce. The move is expected to hit senior staff the hardest, helping reduce salary costs by as much as 4 percent.
Trump, who is now being tested daily for the coronavirus, told reporters Friday that he was "not worried" about the potential transmission of the disease among people close to him, adding that "strong precautions" had been taken in the White House.
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Trump and his fellow Republicans have sought to make the caravan and immigration major issues ahead of the Nov 6 midterm congressional elections, in which the president's party is trying to maintain control of the House of Representatives and the Senate.
Trump's announcement came days after a meeting between Kim and President Xi Jinping was held in Dalian, Liaoning province, in Northeast China.
Trump tweeted on Saturday that the DPRK had agreed to not conduct another missile test until after the proposed meetings had taken place, as he sought to rally international support for a potential summit.
Trump also took aim at the nuclear deal reached between Iran and world powers of Britain, China, France, Russia and the United States plus Germany in July 2015, under which Iran agreed to limit its uranium-enrichment activities in return for the lifting of Western and international sanctions.