Biden's original goal had been 100 million shots by the end of his first 100 days, but that number was reached in March.
Still, he acknowledged that his administration fell short of its goal to deliver at least one shot to every teacher, school staff member and childcare worker during the month of March, to try to accelerate school reopenings.
Harris praised the workers and those receiving their vaccine at a site set up at a local union hall, and spoke of spring as "a moment where we feel a sense of renewal".
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".
"That would be a setback for public health, but that would be a psychological setback, too", he said during an interview with the National Press Club.
Use-of-Force Trainer Testifies in Chauvin Trial
The incident prompted protests in many cities around the United States and internationally against racism and police brutality. Mr Nelson has suggested that onlookers, many of whom were shouting at Chauvin, might have affected officers' response.
America has lost more than half a million lives to the virus. "That would be bad", Fauci said.
The new deadline is two weeks ahead of Biden's previous deadline.
"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.
Biden is also expected to announce that the USA administered 150 million doses in his first 75 days in office, a pace that puts him on track to surpassing his previously stated goal of reaching 200 million doses in his first 100 days.
Most states have either made vaccines available to all residents 16 and older or announced plans to do so by mid-April.
Parts of Ontario Could Be Headed to Stay-at-Home Order
Lawrence Loh issued a Section 22 order mandating the immediate closure of all schools in the region for at least two weeks. More than 76,000 doses of a COVID-19 vaccine were administered in Ontario since Monday's report.
President Biden's announcement that US adults will be eligible for coronavirus vaccines by April 19 comes after multiple media outlets cast doubt on former President Donald Trump's 2020 claim there would be enough vaccines for adults by this month.
But eligibility isn't the same as actually being vaccinated.
Psaki said that the strongest interest comes from private businesses looking to reopen sites where "there are large swaths of people", like in stadiums or theaters. "It means they can join the line that day if they have not already done that beforehand". "There will be no federal vaccinations database, and no federal mandate requiring everyone to maintain a single vaccination credential", Psaki said. "There are going to be more people waiting".
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.
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Ontario to implement new restrictions as variant cases rise
The main variant spreading in Ontario - known as B.1.1.7 - is 50 per cent more lethal than previous strains, officials have said. Schools in Thunder Bay and Sudbury have been closed to in-person learning since March, and students are learning remotely.