President Trump on Thursday outlined plans for his administration to classify each county across the United States based on its risk for an outbreak of coronavirus and use that information to create targeted guidelines. In a letter to the nation's governors, Trump spoke optimistically about expanded testing capabilities that would allow officials to identify which areas of the country are grappling with outbreaks and where the virus is spreading. Based on that surveillance testing data, federal agencies would determine if a specific county is high-risk, medium-risk or low-risk for the virus. The administration is simultaneously working on new guidelines for...