"Hundreds of millions of doses will be available every month and we expect to have enough vaccines for every American by April", Trump said on September 18, which at the time contradicted outlooks by top medical officials who said most Americans wouldn't be vaccinated until the second or third quarter of 2021.
"We have to ramp up a whole-of-government approach that rallies the whole country and puts us on a war footing to truly beat this virus", he said.
Meanwhile, President Joe Biden has brought forward to 19 April the date by which all American adults will be eligible for a Covid vaccine.
She said the government will be issuing "guidance" with "important answers to questions that Americans have in particular around concerns about privacy, security or discrimination".
The United States "pretty soon" will have enough doses to share with the rest of the world, Biden said to inoculators during his visit the Virginia vaccination site.
Some businesses are pushing for people to show proof of vaccination - before getting on cruise ships or entering a stadium, for instance - as a way to resume pre-pandemic operations without causing the virus to spread.
Dr Anthony Fauci, the nation's top infectious disease expert, has warned that the country is in a "critical time" because "we could just as easily swing up into a surge".
But Biden's announcement of the 19 April deadline was aimed at injecting optimism into a public that's grown tired of the restrictions, and it comes as a flood of vaccine is being sent to states this week.
There appeared to be some confusion over whether Trump meant all Americans would be vaccinated by April or could get vaccinated by then, but CNN's lead sentence appeared to suggest Trump meant the latter in terms of supply.
At least a dozen states opened eligibility to anyone 16 and older on Monday alone, while New Jersey and OR announced this week that all residents 16 and older will become eligible on April 19.
Biden said previous year most Americans would not get a vaccine until "well" into 2021.
Psaki went on to clarify this doesn't mean everyone will receive a vaccine, just that everyone will then be eligible to schedule one starting on April 19.
Seniors still waiting to be vaccinated should seek appointments quickly "because the lines are going to become longer" after April 19, Psaki said. "We need to ask people to do that for a few more months".
The White House said Monday that almost 1 in 3 Americans and over 40% of adults have received at least one shot, and almost 1 in 4 adults is fully vaccinated. In the weeks since, the unaccounted for states - New York, Wyoming, South Carolina and Arkansas - have all opened vaccines to the general public.
Two of the three vaccines requires two doses administered several weeks apart.