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'You should want to know how this happened': Fauci promotes probe of Covid-19 origins

02:05

Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, talks with Rachel Maddow about the value of knowing how the Covid-19 pandemic began, to draw lessons to prevent future pandemics, but criticizes attacks on him personally by right-wing personalities as misleading and distorted.