"Weird. I don't remember Biden campaigning on the 'nothing we can do about the virus trajectory' platform," wrote the Washington Examiner's Andrew Mark Miller.
"Haven't we been told for months that restrictions and mandates were necessary to change the trajectory of the pandemic in the next several months?" former Republican Congressman Justin Amash said.
The President has repeatedly warned that the situation is likely to worsen before it improves.
Biden's admission came after, in one of his first executive actions, he mandated mask-wearing and social distancing on all federal property and by all federal employees for the first 100 days of his term.
"The brutal truth is it's going to take months before we can get the majority of Americans vaccinated," he said on Thursday.
"So, while we increase vaccinations, we're going to take steps necessary now to slow the spread of the disease as well.
"The experts say by wearing a mask from now until April, we'd save more than 50,000 lives going forward. 50,000 lives. So I'm asking every American to mask up for the next 100 days."