BBC News:- US President Joe Biden has announced sweeping federal Covid-19 measures that require workers at large companies to be vaccinated or face weekly testing. The new measures, which also include a vaccine mandate for millions of federal workers, come as Mr Biden faces pressure to combat a surge in cases. Over 650,000 Americans have died with Covid-19 and hospitals are at capacity. The president had promised a 'summer of freedom' from the virus, but the Delta variant has instead run rampant. In an address at the White House on Thursday, Mr Biden directed the US Department of Labor to