Trump and Melania are paying a three-day state visit to China from Wednesday to Friday.
Treasury Secretary Steven Mnuchin later said on Twitter that restrictions would apply, not specifically to China, but "to all countries that are trying to steal our technology".
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 hasn't conceded the election to Biden, and the Trump administration is pressing ahead with legal challenges in several battleground states that Biden is projected to win. Republicans in Congress are following Trump's lead in not recognizing Biden's victory. Only four Republican senators have congratulated him.
Trump, who previously said Singapore was under consideration, said agreement had been reached on a date and venue and details would be announced within three days.
Trump says in a speech at the group's annual meeting in Las Vegas that he's grateful to members for "your incredible support and your outstanding commitment to our country to our safety and to electing more Republicans."
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Trump has been advocating a border wall but Congress has repeatedly refused to approve funding for it, slammed by Democrats as costly and ineffective.
Trump also reiterated his will to reopen the US economy, saying, "We want to get it open soon, that's why I think maybe we're getting to the very top of the curve."
Trolleys were introduced in the 1990s when a booming economy led to a groundswell of consumer goods, and it became a booming business thanks to the large volumes of passengers. One trolley could sell 10,000 yuan worth of goods during one train trip, Yang said, though most passengers still favored cheap snacks.
Trump has been reshuffling the Department of Homeland Security, which oversees immigration and border security, in the push for a tougher direction in immigration enforcement.