FILE - In this March 5, 2020, file photo, Dr. Deborah Birx, Ambassador and White House coronavirus response coordinator, holds a 3M N95 mask as she and Vice President Mike Pence visit 3M headquarters ...

A major US mask manufacturer, 3M, says the government has asked it to stop exporting US-made N95 respirator masks to Canada and Latin America. The request had "significant humanitarian ...