The call Wednesday came through Kyle Brown's phone, like the previous time, as No Caller ID.

Elizabeth Warren, the senior U.S. senator from Massachusetts and former presidential candidate, wanted to talk again.

The first time she called, on Feb. 14, she thanked Brown for his $5 contribution to her campaign – his first political contribution ever. Her call to him was one of the many personal calls Warren livestreamed on Twitter before dropping out of the presidential race in early March.

On Wednesday, Warren had something else to talk to Brown about: his work as a registered nurse in the intensive care unit at Buffalo General Medical Center.

"She asked what it has been like taking care of Covid patients, and wanted to know if our health care institutions are taking care of us, and if we are safe and protected when we take care of these patients," Brown recounted.

"She asked if we have the capabilities in place to implement testing for Covid, and also to be able to test health care workers who are exposed to Covid and potentially require testing," he said.