Scientists have concluded that 130,000 lives could be saved in the United States in the coming months if there was universal mask wearing. But Mr. Trump mocks facial coverings and disparages medical experts, undercutting their credibility with the public, most notably Dr. Anthony S. Fauci, the federal government’s chief epidemiologist who now has to have a security detail after vilification by the president and his allies. With views of the virus increasingly falling along party lines, many Americans express distrust over a possible new vaccine, which could lead to widespread resistance…
