U.S. officials were deciding where to dock a cruise ship in California with 21 virus cases aboard and four American universities canceled in-person classes as sweeping efforts to contain the outbreak that started in China spread to the West. The Grand Princess, with 3,500 people aboard, was in international waters off San Francisco late Friday. President Donald Trump, speaking at the U.S. Centers for Disease Control and Prevention in Atlanta, said he would have preferred not to let the passengers disembark onto American soil but would defer to the recommendations of medical experts.