Doocy: Has the WH seen any circumstantial evidence that it did not originate from a lab?
Psaki: I would caution you against disproving a negative... when it comes to getting to the bottom of the root causes of a pandemic that has killed hundreds of thousands of people in the US pic.twitter.com/qYzrAuapKa

— Acyn (@Acyn) May 20, 2021