Trump paid for 800 million doses of the vaccine before he left office.
Sorry you are not in command of the facts.
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"Here’s what the Trump administration’s initial contracts called for drug makers to supply to the U.S. government:
Pfizer-BioNTech: 100 million doses (2 dose regimen)
Moderna: 100 million doses (2 dose regimen)
Johnson & Johnson: 100 million doses (1 dose regimen)
AstraZeneca: 300 million doses (2 dose regimen)
Novavax: 100 million doses (2 dose regimen)
Sanofi-GlaxoSmithKline: 100 million doses (1 or 2 dose regimen)
In total, the amounts agreed to under these contracts equal about 800 million vaccine doses, or enough for more than 400 million people.
The U.S., based on U.S. Census estimates, has around 328 million people, of whom about 255 million are older than 18. (Vaccines are not yet authorized for children.)
So it appears that the Trump administration’s contracts with drugmakers did cover enough doses to vaccinate the entire U.S. adult population — and then some. By that measure, Biden’s statement is inaccurate. "
Source is public documents and contracts -
https://www.statesman.com/story/news/politics/politifact/2021/03/08/covid-vaccine-fact-check-biden-criticizes-trump-contracts/4628285001/