More than 500,000 coronavirus test kits are lying unused around the United States.

Deborah Birx expressed her frustration with cracks in the country’s comprehensive response to the coronavirus that has left hundreds of thousands of tests sitting unused while state governors complain about a lack of kits. Birx, who is coordinating the White House’s coronavirus response, said the number of unused test kits is at about 500,000 at a press conference on Tuesday.