Trump said a lot of drugs have been sent to Michigan for testing.
Trump pledged during the presidential campaign to renegotiate the accord, but he has wavered on the issue since winning the presidency. His top officials have appeared divided about what to do about the deal, under which the United States pledged to significantly reduce planet-warming carbon emissions in the coming decade.
Trump had just attended the Group of Seven summit in Canada. He told reporters after the G7 meeting early on Saturday that he would be leaving for Singapore "on a mission of peace".
Trump said he had told one of his sons, who asked how bad the situation really is, that "It's bad, it's bad. But we are hopefully going to be a best case, not a worst case."
Trump tested positive for COVID-19 on Oct 1 and the coming Saturday would be day 10 since the diagnosis.
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".
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Trump oversaw the signing of the US-Japan Trade Agreement and US-Japan Digital Trade Agreement, which slashed Japanese tariffs on .2 billion worth of US food and agricultural imports while cutting US tariffs on million in Japanese agricultural goods. It also eased quotas on Japanese beef imports.
Trump said that he wants to have "great 5G".
Trump's advisers had debated a return to the daily briefings that were held in March and April because he often used them to spar with reporters and criticize governors, members of Congress, China and others while frequently making inaccurate statements about the virus.
Trump received financial support from the NRA during the 2016 presidential campaign, but some of the gun control measures that appeared to have had his endorsement, including raising the minimum age to 21 for more weapons, run against what the NRA stands for.