Rep. Katie Porter (D-CA) did something remarkable today. She used math to get a CDC official to commit free coronavirus testing. The Washington Post writes about this exchange Porter had with CDC director Robert Redfield. It happened Thursday during a congressional hearing on coronavirus:

“Will you commit to invoking that and to provide testing for every American?”

He repeatedly declined to commit, saying that CDC is collaborating with the Department of Health and Human Services to “operationalize” their response.

Porter persisted. “You can make that commitment now,” she said, demanding a response. “My answer is yes,” Redfield finally replied.