Trump also noted that he seeks to reduce the number of US troops in the central Asian country to 8,600, or even to a much lower level because of "new weaponry and technology."
Trump last met with Putin in November in Vietnam on the sidelines of an Asia-Pacific summit.
Trump confirmed at Monday’s coronavirus task force news briefing that he had spoken with Biden for "probably 15 minutes" and that the two had "a really wonderful, warm conversation".
Trump said the United States would build "tent cities" to house migrants seeking asylum, rather than releasing them while they await court decisions.
Trump's attorney filed a motion on Wednesday with the Supreme Court after Texas Attorney General Ken Paxton alleged that new voting processes in key swing states of Georgia, Michigan, Pennsylvania and Wisconsin in the midst of the coronavirus pandemic skewed the presidential election results.
Trump-Kim summit will be held at the Capella Hotel on Sentosa Island in Singapore, according to White House spokeswoman.
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Trump's arrival in London came the day after the US Ambassador in London, Woody Johnson, gave an interview to the BBC on the topic of future trade relations, and when asked about American interest in Britain's free at point of use National Health Service, said "I think probably the entire economy would in a trade deal, all things that are traded would be on the table," provoking public outrage.
Trump, who has repeatedly called the Russia probe a "hoax" or "witch hunt", has ratcheted up pressure on it in the past months, amid a reshuffling of his legal team.
Trump needs a strong economy when he seeks re-election in 2020. Since 1900, about 80 percent of incumbent presidents have been re-elected. Since Franklin Delano Roosevelt won the White House in 1932, every incumbent president who campaigned with a strong economy has been re-elected. President Jimmy Carter, a Democrat, lost his bid for re-election in 1980 because unemployment reached 7.15 percent and inflation was 12.67 — a toxic combination known as "stagflation" that strangled the economy.
Tu has been interested in the culture since childhood. At university, she joined the hanfu club, becoming president. She also learned a great deal about traditional hairstyles and even made her first set of hanfu clothing.