By Jeff Mason and Carl O'Donnell WASHINGTON (Reuters) -U.S. President Joe Biden urged states to pause reopening efforts and a top health official warned of “impending doom” on Monday, amid a surge in COVID-19 cases that threaten efforts to quash the coronavirus pandemic. Biden said 90% of U.S. adults would be eligible for vaccination by April 19, and 90% of Americans would have a vaccination center within five miles (8 km) of their homes by then, as his team ramps up its drive to get vaccine shots in people's arms. But the administration issued a stark warning: cases are rising, hospitalizatio…
