intelligence community reached conclusions on one side, some on the. after a number of them have said that they just don't have enough information to be sure. >> early in the, pandemic many prominent scientists discredited the so-called lab leak theory. one group writing a letter published in the lancet medical journal saying, we stand together, to strongly condemn conspiracy theory, suggesting that covid-19 does not have a natural origin. >> but other medical professionals have a long refused to rule it out. >> these kinds of lab leaks happen all the time actually. even here in the united states. we've had mishaps. in china, the last six known outbreaks of sars one have been out of labs. >> even doctor anthony fauci, the longtime director of the national institute of allergy and infectious diseases agreed that it was possible. >> it might possibly have been something that the chinese have