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The Chinese Center for Disease Control and Prevention's director said Saturday authorities are considering mixing COVID-19 vaccines because the country's domestically made doses "don't have very high protection rates," per AP.

Why it matters: The remarks by the Gao Fu at a news conference in the southwestern city of Chengdumark mark the first time a Chinese health official has spoken publicly about the low efficacy of vaccines made in China.

The only survivor of this week's mass shooting in South Carolina by former NFL player Phillip Adams has died of his injuries, authorities said Saturday.

Details: Robert Shook, 38, an air conditioning technician from Cherryville, North Carolina, died of gunshot wounds from Wednesday's shooting at a doctor's home in Rock Hill, S.C., which claimed the lives of five other victims.

A top Egyptian archaeologist on Saturday outlined details of a newly rediscovered "lost golden city" near Luxor that dates back more than 3,000 years.

Why it matters: Zahi Hawass told NBC News the large ancient city, unveiled Thursday, tells archaeologists for the first time "about the life of the people during the Golden Age." Johns Hopkins University Egyptology professor Betsy Brian said in a statement it's "the second most important archeological discovery since the tomb of Tutankhamen."

Strong storms lashed the South early Saturday, spawning at least one tornado and unleashing powerful winds and hail. And forecasters warned more severe weather was expected to hit parts of the region in the coming hours.

Details: Thousands of customers lost power in Florida, Mississippi, Arkansas, Texas and Louisiana, according to tracking site poweroutage.us. An F3 tornado that hit St Landry Parish, Louisiana, killed one person and wounded seven others.

President Biden is considering appointing Matthew Rojansky, head of the Wilson Center's Kennan Institute, as Russia director on the National Security Council, according to a source familiar with the situation.

Why it matters: Rojansky has been praised for his scholarship on Russia and is frequently cited in U.S. media for his expert commentary. But his work has drawn criticism — including in a 2018 open letter from Ukrainian alumni of Kennan that blasted the think tank he runs as an "unwitting tool of Russia’s political interference."

1. Health: Coronavirus cases hold steady at 65,000 per day — CDC declares racism "a serious public health threat" — WHO official: Brazil is dealing with "raging inferno" of a COVID outbreak.
2. Vaccines: America may be close to hitting a vaccine wall — Pfizer asks FDA to expand COVID vaccine authorization to adolescents — CDC says Johnson & Johnson vaccine supply will drop 80% next week.
3. Economy: Treasury says over 156 million stimulus payments sent out since March — More government spending expected as IMF projects 6% global GDP growth.
4. Politics: Supreme Court ends California's coronavirus restrictions on home religious meetings.
5. World: Iran tightens COVID restrictions amid fourth wave of pandemic.
6. Variant tracker: Where different strains are spreading.

Maryland's Democratic-controlled legislature on Saturday voted to override Republican Gov. Larry Hogan's vetoes of police accountability legislation.

Why it matters: Maryland is the first state to repeal its Law Enforcement Officers Bill of Rights, the Washington Post notes.

NASA announced Saturday it rescheduled its Ingenuity Mars helicopter's first experimental flight, originally planned for Sunday.

The latest: "During a high-speed spin test of the rotors on Friday, the command sequence controlling the test ended early due to a 'watchdog' timer expiration," NASA said in a statement. "This occurred as it was trying to transition the flight computer from ‘Pre-Flight’ to ‘Flight’ mode."

During this weekend’s highly anticipated donor retreat hosted by the Republican National Committee in Palm Beach, Ohio Senate candidate Josh Mandel was escorted off the premises while his primary opponent, Jane Timken, was allowed to stay, two sources with direct knowledge of the situation tell Axios.

What we’re hearing: The invitation-only event is taking place at the Four Seasons Resort, and the RNC reserved the entire hotel. While Timken, former Ohio GOP chair, was invited to the event “because she is a major donor” — Mandel was not, so he was asked to leave, according to one of the sources.

John Kerry, President Biden's special climate envoy, is expected to travel to China next week for meetings with officials aimed at boosting collaboration, the Washington Post reported Saturday.

Why it matters: China is the world's largest carbon dioxide emitter and the U.S. is second-largest.

Devin Murphy, Rep. Matt Gaetz's legislative director, has stepped down amid a federal investigation into sex trafficking allegations against the Florida Republican congressman, the New York Times first reported and Axios has confirmed.

The latest: "It's been real," Murphy wrote in an email, obtained by Axios, to Republican legislative directors on Saturday morning, with the subject line: "Well...bye."

Rep. Dan Crenshaw (R-Texas) said in a statement Saturday he will be blind for roughly a month after getting surgery to reattach the retina in left eye.

Why it matters: Crenshaw, who lost his right eye and sustained severe damage to his left eye during his third deployment to Afghanistan in 2012, said he will be "pretty much off the grid for the next few weeks."

A new 20-year-forecast for the world: increasingly fragmented and turbulent.

The big picture: A major report put out this week by the National Intelligence Council reflects a present rocked by the COVID-19 pandemic. How the next two decades will unfold depends largely on whether new technologies will ultimately unite us — or continue to divide us.

Rep. Matt Gaetz (R-Fla.) doubled down Friday night, saying he's not "going anywhere," and vowing, "I have not yet begun to fight," amid a federal investigation into sex trafficking allegations.

What he's saying: “I’m built for the battle, and I’m not going anywhere,” Gaetz, who denies the allegations, said during a Women for America First event at the Trump National Doral Miami resort.