The credibility of two of the nation’s leading public health agencies was under fire this week after controversial decisions that outside experts said smacked of political pressure from President Donald Trump as he attempts to move past the devastating toll of the coronavirus ahead of the November election. The head of the FDA grossly misstated, then corrected, claims about the lifesaving power of a plasma therapy for COVID-19 authorized by his agency. Then the CDC quietly updated its guidelines to suggest fewer Americans need to get tested for coronavirus, sparking outrage from scientists.