"Dr Redfield, who led the US Centers for Disease Control and Prevention when the outbreak began in 2020, was an early proponent of the lab leak theory.
He told the House select subcommittee, formed by the new Republican majority in the US House of Representatives, it was "not scientifically plausible" to him that the virus had natural origins.
He claimed he was "sidelined" at the beginning of the pandemic and excluded from meetings as his views were not in line with other major scientists like Dr Fauci, the de-facto face of the US pandemic response."