U.S. coronavirus death toll approaches milestone of 500,000

In this Feb. 19, 2021, file photo President Joe Biden, right, and Michigan Gov. Gretchen Whitmer, left, tour a Pfizer manufacturing site in Portage, Mich. (AP Photo/Evan Vucci, File)

The U.S. stood Sunday at the brink of a once-unthinkable tally: 500,000 people lost to the coronavirus.