President Joe Biden endorsed coronavirus vaccine mandates on Thursday, using some of his strongest rhetoric to date to encourage private companies to require employees to get the vaccine. “In addition to providing incentives to encourage vaccination, it’s time to impose requirements on key groups to make sure they’re vaccinated,” Biden said at an event at the White House, endorsing the idea of private businesses everywhere requiring their employees to get vaccinated. “I’d like to see them continue to move in that direction,” he said, about private businesses. He said he asked the Justice Department to issue an opinion on the...