By INLU ZHANG in New York | China Daily Global | Updated: 2021-07-30 10:21 Share CLOSE US President Joe Biden speaks about the pace of coronavirus disease (COVID-19) vaccinations in the United States in the East Room of the White House in Washington, July 29, 2021. [Photo/Agencies] President Joe Biden on Thursday announced that millions of federal workers and on-site contractors will have to show proof of vaccination against COVID-19 or wear masks, practice social distancing and submit to regular testing under sweeping new guidelines. Government employees who don't show they have been vaccinated will be subject to weekly or twice-weekly coronavirus tests and restrictions on official travel.