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  • Oath Keepers founder in court

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  • 'Outside of its competence,' right-wing Supreme Court blocks Covid protections for workers

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'We have the tools to handle this': Health officials brace for Omicron variant

09:59

Dr. David Kessler, chief science officer for the Biden administration's Covid-19 response, answers questions and concerns from Rachel Maddow about the current state of vaccines and treatments for Covid and how the Omicron variant changes the picture.