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U.S. President Joe Biden announced a series of measures on Tuesday aimed at ramping up coronavirus vaccine allocation and distribution, including the purchase of 200 million more vaccine doses and increased distribution to states by millions of doses next week.

With those additional doses, Biden said there would be enough to fully vaccinate 300 million Americans -- nearly the entire US population -- by the end of summer or early fall, according to CNN.

He described efforts to combat Covid-19 as a "wartime undertaking."

"We now have a national strategy to beat Covid-19. It's comprehensive. It's based on science, not politics. It's based on truth, not denial, and it is detailed," he said.

As part of the new efforts announced Tuesday, the US will buy 100 million more doses from Pfizer/BioNTech and 100 million more from Moderna -- the two-dose vaccines that have been granted emergency use authorization by the US Food and Drug Administration. Pfizer and Moderna are working to step up production, and Biden said that the additional doses will be available this summer.

The new purchase will increase the planned Covid-19 vaccine supply from 400 million to 600 million, an official told reporters on a call on Tuesday ahead of Biden's remarks.