President Donald Trump says he is considering placing coronavirus-stricken New York state and adjacent areas under "quarantine" to prevent people there from spreading the virus to other parts of the US. The number of New York coronavirus cases has increased to 52,318 and deaths to 728. "There's a possibility that sometime today we'll do a quarantine -- short-term, two weeks - on New York, probably New Jersey, certain parts of Connecticut," Mr Trump said as he left the White House on Saturday. The measure would be aimed at restricting travel from one of the country's most heavily populated regions to other parts of the United States, especially the southern state of Florida, which is popular with New Yorkers in winter. "Because they're having problems down in Florida. A lot of New Yorkers are going down. We don't want that. Heavily infected," Mr Trump said. Later the US leader confirmed the idea on Twitter. A decision "will be made, one way or another, shortly," he said. The New York city area has been the most seriously hit by the Covid-19 virus in the United States. But New York Governor Andrew Cuomo, who spoke with Mr Trump earlier on Saturday, said this issue did not come up in those discussions. "I don't even know what that means," Mr Cuomo told a press briefing. "I don't know how that could be legally enforceable. And from a medical point of view, I don't know what you would be accomplishing," Mr Cuomo said. "But I can tell you, I don't even like the sound of it. Not even understanding what it is, I don't like the sound of it," the governor added. Four additional temporary hospital sites are being build with a total capacity of 4,000 additional beds and New York pharmacies have been asked to deliver medications free of charge.