President Biden warned Friday that the rise of COVID-19 variants could lead to a surge in cases in the coming weeks, even as his administration makes progress on its goal of administering 100 million vaccine doses in its first 100 days in office.

President Biden warned Friday that the rise of COVID-19 variants could lead to a surge in cases in the coming weeks, even as his administration makes progress on its goal of administering 100 million vaccine doses in its first 100 days in office.