A new Covid-19 variant called Omicron is spreading throughout the world and public health officials are worried about its transmissibility. President Biden addressed the nation saying, "this variant is a cause for concern — not a cause for panic." But the variant is reigniting anxieties about the pandemic.This episode: White House Correspondent Tamara Keith, White House correspondent Scott Detrow, and health correspondent Allison Aubrey.Connect:Subscribe to the NPR Politics Podcast here.Email the show at nprpolitics@npr.orgJoin the NPR Politics Podcast Facebook Group.Listen to our playlist The NPR Politics Daily Workout.Subscribe to the NPR Politics Newsletter.Find and support your local public radio station.