The COVID-19 testing czar for former President Donald Trump says the “most likely” origin for the pandemic was an accidental escape from a Wuhan lab, testifying Tuesday as one of four expert witnesses during a House Republican effort to get to the bottom of how the coronavirus emerged.

Brett Giroir, an assistant secretary of health and a member of Trump’s White House Coronavirus Task Force, said: “I assess that the most likely origin was an accidental infection of laboratory personnel from the Wuhan Institute of Virology, with secondary transmission to the local population and subsequent spread to hundreds of millions of people around the world.”