Dr. Anthony Fauci talks about the origins of COVID-19 and the lessons learned 3 years later

Dr. Anthony Fauci, former director of the National Institute of Allergy and Infectious Diseases, joins CBS News’ John Dickerson to reflect on three years since the start of the coronavirus pandemic. He acknowledges that we may never know for sure the origins of COVID-19, and has called the scientific response to the virus one of the biggest advances he has seen.