"U.S. to release 60 million AstraZeneca doses to other countries as they become available," he wrote on Twitter.

The Associated Press earlier on Monday reported the doses would be shared in coming months following a federal safety review.

The Biden administration in March said it would send roughly 4 million of the drugmaker's vaccine to Canada and Mexico and is under growing pressure now to expand sharing of its stockpile with India and other countries.

(Reporting by Susan Heavey; Editing by Tim Ahmann)