The Trump administration is formalizing new guidance to recommend that many Americans wear face coverings in an effort to slow the spread of the new coronavirus, as the president is aggressively defending his response to the public health crisis. The recommendations, still being finalized Thursday, were expected to apply to those who live in areas hard-hit by community transmission of the virus that causes COVID-19. A person familiar with the White House coronavirus task force’s discussion said officials would suggest that non-medical masks, T-shirts or bandannas be used to cover the nose and mouth when outside the home — for instance, at the grocery store or pharmacy. Medical-grade masks, particularly short-in-supply N95 masks, would be reserved for those dealing directly with the sick.