Trump's remarks came a day after his meeting with Kim Yong Chol, vice chairman of the DPRK's ruling Korean Workers' Party Central Committee, at the White House.
Trump is set to start his two-day visit on Saturday, and hold a summit with President Moon Jae-in on Sunday, following G20 Summit in Japan's western city of Osaka, a Blue House spokeswoman said.
Trump during the election campaign had accused China of manipulating its currency to gain from exports, while many economists have argued that the Chinese currency, RMB, has been at equilibrium level in recent years.
Trieu A Lien, a 57-year-old Vietnamese, has been trading cloth in Pingxiang, a Chinese border city since 1992.
Trump's comments, which came just a few days after Washington said it was no longer focused on making Assad leave power, suggested a clash between the Kremlin and Trump's White House after initial signals of warmer ties. Trump did not mention Russia in his comments on Wednesday but Secretary of State Rex Tillerson said it was time for Russia to think carefully about its support for Assad.
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.
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Trump's threat to impose tariffs on auto imports would hit European carmakers BMW Daimler and Volkswagen hard, as well as Japanese and South Korean car companies.
Trump had been expected to appear in person in Gettysburg, until another member of his legal team tested positive for the coronavirus. Few at the meeting wore masks.
Trump also ordered officials to introduce regulations that would disqualify asylum seekers who entered the country illegally from obtaining work permits while their claims are pending. Currently, asylum seekers who enter both legally and illegally are allowed to work while their claims wind through the courts.
Trump critics say any efforts by the president to hinder an FBI probe could amount to obstruction of justice. Such an offense potentially could lead to Trump being impeached, although his fellow Republicans who control Congress have shown little appetite for such a move.