If you conduct any scientific investigation, you should open to any possible scenarios/hypothesis.
Why the heck Uncle Joe, a life long politician who knew nothing about science (or even spell science) told IC you should only look for two possible origins: natural origin or lab incident.
But in reality, there could be all sort of possibilities:
1. Collect the virus from nature, perform gain-of-function on purpose, and release it on purpose.
2. Collect the virus from nature, perform gain-of-function on purpose, and leak from the lab accidentally.
Disclaimer: I didn't vote for this confused, inept, incompetent old fool.