Trump mentioned New York, Chicago, Philadelphia, Detroit, Baltimore and Oakland as possible destinations for federal forces, adding that the cities' mayors are "liberal Democrats".
Trump said on March 1 that the US will impose tariffs of 25 percent on steel imports and 10 percent on aluminum this week, that it would apply to all countries and "for a long period of time".
Trump said at Friday's meeting, "I think we have a very good chance of making a deal," adding both parties want to make any deal "meaningful" and "good for both countries".
Treasures of Chinese fine paintings, archaic bronzes, sculptures and ceramics are featuring at Christie's and Sotheby's Asian Art Week auctions in New York, which started on Tuesday.
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, who according to press secretary Sarah Sanders, described his visit as "very humbling and sad," left in his motorcade after about 30 minutes at the synagogue.
山东强直脊柱炎能否评残
Trump expresses optimism about securing a deal in summit with Kim
Trump, notably, did not testify in his own impeachment proceedings over the past few weeks.
Trump held his call with campaign staffers from Las Vegas, where he was on the third day of a western campaign swing. He was to hold Arizona rallies in Prescott and Tucson later in the day before returning to the White House.
Trump has said tariffs are needed to protect US companies from what he sees as unfair competition abroad. In October, the US had a .2 billion trade surplus with Brazil and a .7 billion trade surplus with South and Central America as a whole, US government statistics show.