The mask may have reached a tipping point.

U.S. President Donald Trump’s administration on Monday pushed to encourage mask-wearing, explicitly endorsing a measure widely seen as crucial to stemming the coronavirus pandemic, and potentially quelling a bitter debate that experts say costs lives.

The president, who for months resisted covering his face in public, tweeted that "it is Patriotic to wear a face mask when you can’t socially distance.” And Vice President Mike Pence told governors in a teleconference that he supported their mask mandates, with the administration even sending a memorandum to New Jersey recommending that it continue its order. The reversal followed polls that showed Trump’s refusal to champion masks was out of step with citizens terrified by rising case counts nationwide.