John Ruwitch

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Updated at 3:45 p.m.

China will close its borders to foreigners starting on Saturday, March 28, in a dramatic step to try to stop the coronavirus coming in from abroad.

The move is the latest in a string of tough steps by the Chinese government to combat the virus, which first appeared in the city of Wuhan late last year and has spread widely since.

California Gov. Gavin Newsom expects about 56% of the state's population – more than 22 million Californians – to be infected with the coronavirus over an eight-week period.

The estimate was in a letter Newsom sent to President Trump, dated Wednesday, asking Trump to deploy the naval hospital ship Mercy to the waters off of Los Angeles through the beginning of September.