As COVID-19 continues to surge across the U.S., six states reported over 10,000 new cases on Saturday, according to the COVID Tracking Project.

They were California, Florida, New York, Ohio, Pennsylvania and Texas.

Another seven states reported over 5,000 new cases: Arizona, Illinois, Indiana, Massachusetts, New Jersey, North Carolina and Tennessee.

In total, according to the tracker, there were 223,365 new U.S. cases reported on Saturday, 2,477 deaths and a record 108,487 people currently hospitalized.

The Advisory Committee on Immunization Practices, an independent group of medical experts that advises the Centers for Disease Control and Prevention, in a virtual meeting on Saturday voted 11-0 recommending the Pfizer vaccine for Americans 16 years and older.

Three committee members recused themselves because they had a conflict of interest.

This recommendation now heads to CDC Director Robert Redfield, who must sign off before doses can be administered.

 
ABC News’ Lauren Lantry contributed to this report.

Country music legend Charley Pride died of COVID-19 complications on Saturday.

Last month, the 86-year-old performed at the CMA Awards, where he accepted the Lifetime Achievement Award.

Pride was the first Black member of the Country Music Hall of Fame.

“Between 1967 and 1987, Pride delivered 52 Top 10 country hits, won Grammy awards, and became RCA Records’ top-selling country artist,” said the statement announcing his death. “His musicality opened minds and superseded prejudice.“

California broke new records on Saturday for daily cases (over 35,700), daily deaths (225) and total hospitalizations (13,410).

Gov. Gavin Newsom has issued stay-at-home orders to regions if their intensive care unit capacity falls below 15%. The San Joaquin Valley, Southern California and the Greater Sacramento region all have fallen below that threshold, while the Bay Area and Northern California have not.

ICU capacity in the San Joaquin Valley fell to 0% on Saturday and was at 5.3% in Southern California.

ABC News’ Matt Fuhrman contributed to this report.

The chief science adviser to Operation Warp Speed, the U.S. government's initiative to expedite vaccine development, said he doesn't know what vaccine-related executive order President Donald Trump is expected to sign on Tuesday.

"Frankly, I don't know and, frankly, I'm staying out of this. I can't comment," Dr. Moncef Slaoui told ABC News chief anchor George Stephanopoulos in an interview Tuesday on "Good Morning America."

When pressed on the matter, Slaoui added: "Our work is, you know, rolling. We have plans. We feel that we can deliver the vaccines as needed, so I don't exactly [know] what this order is about."

Trump is expected to discuss the order at a COVID-19 vaccine summit to be held at the White House later Tuesday, multiple White House officials told reporters during a background briefing on Monday evening. While it's not entirely clear on how exactly the order would work, the move is designed to prevent the U.S. government from shipping any vaccine doses it has purchased to aid foreign countries until all the needs within the United States are met.

White House officials also denied reports that the Trump administration turned down an offer last summer to purchase an additional 400 million doses of a COVID-19 vaccine developed by U.S. pharmaceutical giant Pfizer and its German partner BioNTech, and that the companies now may not be able to provide more of their vaccine to the United States until June 2021 because they have committed those doses to other countries.

When asked about the matter, Slaoui explained Operation Warp Speed's strategy in securing vaccine doses.

"We selected six different vaccines to build a portfolio to manage the risk that some may work and some may not work, but also to ensure that as more than one would work that we would accumulate vaccine doses from this portfolio of vaccines," he said. "If somebody came to us and said, let's buy more of this vaccine or that vaccine, no one reasonably would buy more from any one of those vaccines because we didn't know which one would work and which one may be better than the other. Once the vaccine's performance becomes known is the right time, given the strategy we've taken, to go and order more vaccine doses, which we may be doing. And frankly, the constructive thing to do if one of the suppliers has challenges producing enough vaccine doses is to roll our sleeves and help ensure that capacity can be increased."

Slaoui said he's confident the U.S. government will be getting vaccines to Americans who need them "as soon as possible" and that plans are "still on track."

"We will work with Pfizer to try and increase capacity and have those vaccines available," he said. "We have two more vaccines from J&J and AstraZeneca that will be completing their Phase 3 trials in January and most likely, I hope, be approved for use in February. We have tens of millions of doses from those vaccines, you know, participating to the volume of vaccines we need to immunize the U.S. population as we promised, all of it by the middle of the year 2021 and that's still on track."

Slaoui said Operation Warp Speed has a meeting with President-elect Joe Biden's transition team scheduled for Thursday.

"We look forward to, you know, sharing all the information and working together," he said. "Our objective has always been outside of politics and making sure we make available these vaccines for the U.S. people, and that's what we're doing."

ABC News' Ben Gittleson, John Parkinson and Eric Strauss contributed to this report.