Spokesperson says White House still supports Tokyo hosting the Olympics despite U.S. 'no-travel' travel advisory to Japan in wake of rising COVID-19 cases in the country. US Centers for Disease Control and Prevention and the State Department on Monday warned Americans against travel to Japan because of a surge in coronavirus cases in the country. The alert does not ban US citizens from visiting the country, but they could have an impact on insurance rates for travelers and may factor into decisions by Olympics athletes and spectators on whether to compete in or attend the games, which are due to start in July.