Five months after President Joe Biden declared the U.S. to be on the verge of defeating Covid-19, the virus threatens a winter resurgence across the country.

Biden on Thursday will sketch out his latest plan to quell the pandemic thats dogged his presidency, a day after the first U.S. case of the omicron variant was identified in California. His latest measures include stricter testing requirements for air travelers arriving from abroad, extending a mask mandate and requiring private insurers to reimburse the cost of at-home tests.