The White House on Friday launched a website deeming a laboratory leak as the “true” origin of the covid-19 virus, embracing a theory that has become a popular explanation for a pandemic that has killed more than 1 million Americans but remains divisive in the intelligence community and opposed by many virologists. The new website, which features an image of President Donald Trump striding between the words “Lab Leak,” appears to draw entirely upon a report overseen by House Republicans last year, which concluded the outbreak began with a lab leak in China. The White House site also echoes the...