Trump also said he expected to see a lot of US schools reopen after being shut down by the coronavirus pandemic.
Trump had attacked Cummings, a Democrat in the House of Representatives who has long been a champion for civil rights, in a series of tweets on Saturday, after the lawmaker criticized conditions at U.S. facilities housing migrants along the Mexican border.
Trump previously claimed at the White House on Tuesday that he had "met with some of our great generals and they just seem to feel that this was not some kind of a manufacturing explosion type of event."
Trump has hailed hydroxychloroquine as a "game-changer" for COVID-19. He said last week he was taking it as a preventive measure against the disease. He has since said he is close to finishing his course of treatment and would stop taking the medication in "a day or two".
Trump has often talked about his country's trade deficit with China. On the other hand, cooperation between Beijing and Washington is also regarded as vital to achieving denuclearization of the Korean Peninsula.
Trump arrived in Riyadh on Saturday morning as the first leg of his first foreign visits since his election as US President.
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Trump held a rally in Mississippi on Friday to advocate for Lieutenant Governor of Mississippi Tate Reeves' campaign.
Tsedrub, 45, who was bent over an embroidered apron at a sewing machine, said she liked to be at the workshop in the winter. People would sit idle if not for Phuntsok Tsering's cooperative, she said.
Trump will turn on 72 on June 14.
Trump will not officially launch his reelection campaign until Tuesday, when he plans an elaborate, rally-style event in a huge arena in Orlando, Florida.