Joe Biden on Tuesday warned of 'challenging' weeks ahead as he urged unvaccinated Americans to get vaccinated and boosted claiming it is the best way to protected yourself from the surging Omicron variant of COVID-19.

"There's no excuse, there's no excuse for anyone being unvaccinated," he said before receiving an update from his COVID-19 team. "This continues to be a pandemic of the unvaccinated," he added.

This warning comes just before the supreme court's special session, Friday January 7, over the Biden administration’s nationwide Covid-19 vaccine mandate for large businesses.