"I did take a test that just came out. ... I went to work. I did not wait for it, but it took 14 minutes or something to come up with the conclusion. And it said the president tested negative for Covid-19," Trump said. "So that is the second one. I think I took it out of curiosity to see how quickly it worked and fast it worked. It is a lot easier. I've done them both. And the second one is much more pleasant, I can tell you that."

Trump also tested negative in mid-March, when multiple White House officials were self-isolating and Trump had been in contact with a number of people who either got coronavirus or were in contact with people who did.

Lack of adequate test kits has bedeviled the Trump administration's response to the coronavirus, making it hard for public health officials and scientists to track the spread of the disease and see where hotspots are popping up.

Early on in the crisis, the Centers for Disease Control and Prevention rejected the use of a World Health Organization coronavirus test in favor of a C.D.C. test that initially did not work properly.

