Was US money used to fund risky research in China?

As the debate continues over the origins of the coronavirus, a fresh row has erupted over virus research being carried out in China using US funds.

It's linked to the unproven theory that the virus could have leaked from a lab in Wuhan, the Chinese city where it was first detected.

This idea centres on research carried out on bat viruses at the Wuhan Institute of Virology.

Republican Senator Rand Paul alleges that US money was used to fund research there that made some viruses (not the coronavirus) more infectious and...