After months of butting heads with his medical experts, including the government’s top infectious disease official, Dr. Anthony Fauci, President Trump introduced a new adviser to the administration during his coronavirus briefing on Monday, Dr. Scott Atlas, whose views on Covid-19 and school reopenings more closely match the president's. KEY FACTS A senior fellow at Stanford University's Hoover Institution, a conservative think tank, Atlas is not an infectious disease expert — he’s board-certified in diagnostic radiology, which means he specializes in reading and interpreting imaging like X-rays, CT scans and MRIs, and he served as a professor and chief of...