It comes as the US reached 50 million confirmed cases of Covid-19 on Monday.
Most deaths have been recorded among the unvaccinated and the elderly, and more Americans died in 2021 than in 2020.
The US is again seeing deaths rising at an alarming rate.
The last 100,000 deaths came in just the past 11 weeks, a quicker pace than any at other point aside from last winter's surge.
