WASHINGTON (AP/WMAL) — President Joe Biden received his COVID-19 booster shot on Monday, days after federal regulators recommended a third dose of the Pfizer vaccine for Americans age 65 or older and approved them for others with preexisting medical conditions and high-risk work environments.

“The most important thing we need to do is get more people vaccinated,” Biden said before getting the booster, adding that he did not have side effects after his first or second shots.

The President then went on to criticize the unvaccinated.

“About 23 percent haven’t gotten any shots. And that distinct minority is causing an awful lot of damage for the rest of the country, ” Biden said.

Biden, 78, got his first shot on Dec. 21 and his second dose three weeks later, on Jan. 11, along with his wife, Jill Biden. Biden said the first lady, who’s 70, would also receive the booster dose, but she was teaching on Monday at Northern Virginia Community College, where she is a professor of English.

Speaking on Friday after the Centers for Disease Control and Prevention and the Food and Drug Administration authorized the Pfizer booster, Biden told reporters, “It’s hard to acknowledge I’m over 65, but I’ll be getting my booster shot.” He repeated the joke about being over 65 on Monday.

But the aggressive American push for boosters, before many poorer nations have been able to provide even a modicum of protection for their most vulnerable populations, has drawn the ire of the World Health Organization and some aid groups, which have called on the U.S. to pause third shots to free up supply for the global vaccination effort.

Biden said last week that the U.S. was purchasing another 500 million doses of the Pfizer vaccine — for a total of 1 billion over the coming year — to donate to less well off nations.

Vice President Kamala Harris, 56, received the Moderna vaccine, for which federal regulators have not yet authorized boosters — but they are expected to in the coming weeks. Regulators are also expecting data about the safety and efficacy of a booster for the single-dose Johnson & Johnson shot soon.

At least 2.66 million Americans have received booster doses of the Pfizer vaccine since mid-August, according to the CDC. About 100 million Americans have been fully vaccinated against COVID-19 through the Pfizer shot. U.S. regulators recommend getting the boosters at least six months after the second shot of the initial two-dose series.

Copyright 2021 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. PHOTO AP