Top scientists at the World Health Organization pushed back against the Biden administration's intention to supply booster shots to Americans beginning next month.

"We’re planning to hand out extra life jackets to people who already have life jackets, while we’re leaving other people to drown without a single life jacket," Dr. Mike Ryan, executive director of the WHO’s health emergencies program, told reporters Wednesday. "That’s the reality."

As of Wednesday, 60% of Americans had received at least one dose and 51% were fully vaccinated, compared with 32% of people worldwide who've gotten at least one shot and 24% who are fully vaccinated, according to data from the CDC and Our World in Data.

-ABC News' Zoe Magee

Johnson & Johnson said Wednesday it is "engaging" with the Food and Drug Administration, the Centers for Disease Control and Prevention and other health authorities on a booster of its single-dose COVID-19 vaccine.

The company said it "will share new data shortly regarding boosting" with its vaccine, which one study suggests provides immunity for at least eight months.

The statement comes after the Biden administration said Wednesday it is preparing to roll out booster shots of Pfizer's and Moderna's vaccines to more Americans next month.

People attending large-scale indoor events in California soon will be required to show proof of COVID-19 vaccination or a recent negative COVID-19 test, state officials announced Wednesday.

The new rules apply to indoor events with more than 1,000 people beginning Sept. 20. Tests must be administered within 72 hours of the event.

Currently, attendees have to self-attest to either having the vaccine or a negative test to attend events with more than 5,000 people.

Health officials pointed to the highly transmissible nature of the delta variant in updating the rules.

President Joe Biden plans to issue a memo to Secretary of Education Miguel Cardona Wednesday to counter the Republican governors who have blocked mask mandates in their states.

"Some state governments have adopted policies and laws that interfere with the ability of schools and districts to keep our children safe during in-person learning, with some going as far as to try to block school officials from adopting safety protocols aligned with recommendations from the CDC," according to a fact sheet released by the White House Wednesday.

Biden's memo will ensure the department of education "is doing everything it can to prevent anything from standing in the way of local leaders and school leaders taking steps to keep all students safe in full-time, in-person learning, without compromising students' health or the health of their families or communities," the fact sheet continues.

In a press conference, the president had a blunt message for Republican governors who are banning school districts from requiring masks in schools: "If you aren't going to fight COVID-19, at least get out of the way of everyone else who is trying."

Biden said his administration is not going to "sit by as governors try to block and intimidate educators protecting children," and announced that he's directing Cardona to go as far as using legal action against these governors and that his administration will use COVID-19 relief funds to pay the salaries of educators who defy them.

-ABC News' Justin Gomez

U.S. Surgeon General Vivek Murthy announced at Wednesday's White House briefing, "Having reviewed the most current data, it is now our clinical judgment that the time to lay out a plan for COVID-19 boosters is now."

Murthy said protection against mild disease has decreased, likely a combination of waning vaccine protection over time and the strength of the delta variant, and that the administration is "concerned" that protection could continue to erode.

"Even though this new data affirms that vaccine protection remains high against the worst outcomes of COVID, we are concerned that this pattern of decline we're seeing will continue in the months ahead, which could lead to reduced protection against severe disease, hospitalization and death," Murthy said.

"That is why, today, we are announcing our plan to stay ahead of this virus by being prepared to offer COVID-19 booster shots to fully vaccinated adults 18 years and older," Murthy said. "They would be eligible for their booster shot eight months after receiving their second dose of the Pfizer or Modern mRNA vaccines."

The boosters are set to begin Sept. 20, but Murthy emphasized that this is pending FDA authorization and also reiterated that does not yet apply to J&J recipients.

-ABC News' Cheyenne Haslet