The latest challenge to Joe Biden’s presidency: the Omicron variant

Analysis: after he promised to crush the coronavirus, the rise of a new strain could be a blow to perceptions of his competency

Joe Biden looked out at an audience of government scientists last week and recognized a mask-wearing Anthony Fauci, his top adviser on the coronavirus. I've seen more of Dr Fauci than my wife," he joked. Who's president? Fauci!"

The US president was visiting the frontline of the Covid-19 struggle, the National Institutes of Health in Bethesda, Maryland, where he unveiled a winter plan that includes a drive for vaccine boosters, free at-home testing and fresh requirements for international travelers.