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U.S. to investigate Covid origins after report questions whether the virus leaked from a Chinese lab


President Biden is stepping up efforts to determine the origins of the Covid-19 virus after a U.S. intelligence report raised questions about whether the virus was leaked from a lab in Wuhan, China. NBC News’ Shannon Pettypiece and Janis Mackey Frayer break down what the intelligence community is alleging and how China is responding to the report.