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President Joe Biden said Thursday that the U.S. will have enough supply of the COVID-19 vaccine by the end of the summer to inoculate 300 million Americans.

Biden made the announcement at the sprawling National Institutes of Health complex just outside Washington as he visited some of the nation’s leading scientists on the frontlines of the fight against the disease. He toured the Viral Pathogenesis Laboratory that created the COVID-19 vaccine now manufactured by Moderna and being rolled out in the U.S. and other countries.

The U.S. is on pace to exceed Biden’s goal of administering 100 million vaccine doses in his first 100 days in office, with more than 26 million shots delivered in his first three weeks.