Matthew S. Schwartz

One of the experimental drugs that President Trump received while he was battling the coronavirus has been approved for emergency use by the Food and Drug Administration. The drug, made by the biotech company Regeneron, is the second antibody treatment to win emergency use approval from the FDA.

The treatment combines two antibodies — casirivimab and imdevimab — and administers them together by IV. In a clinical trial of about 800 people, the combination was shown to significantly reduce virus levels within days of treatment.

Donald Trump Jr. has become the latest member of the president's orbit to test positive for the coronavirus.

"Apparently I got the 'rona," the president's son told his Instagram followers late Friday.

"You wouldn't know it based on anything that I felt or have seen," he said. "I've been totally asymptomatic."

Updated 4:30 p.m. ET Monday

Less than one week after assuming the office of the presidency, Manuel Merino has stepped down as interim president of Peru.

Peru's Congress has elected legislator Francisco Sagasti as the country's interim president, Reuters reports. Sagasti, a member of the centrist Morado Party, will serve as Peru's president until the nation's elections in April 2021. He received 97 votes in favor and 26 against.

Sagasti will be the country's third president in a week.

The Trump administration has not cooperated with President-elect Joe Biden's transition team, and top Biden officials say the incoming president is limited in what he can do before his team takes the reins. Still, Biden's coronavirus advisory board co-chair Vivek Murthy says they're doing everything they can to ensure plans are ready to go on Inauguration Day — including stronger mask requirements.

Updated Sunday at 12:30 p.m. ET

Hurricane Iota is expected to hit Central America on Monday, bringing potentially catastrophic winds and life-threatening storm surge.

Iota's arrival comes as the region is still recovering from Hurricane Eta, which made landfall earlier this month as a Category 4 storm.

The U.S. added more than 184,000 confirmed COVID-19 cases on Friday, the fourth day in a row that the country has set a record for daily infections, according to data from the Johns Hopkins University Coronavirus Resource Center.

Four astronauts arrived at the Kennedy Space Center on Sunday to bring the U.S. one step closer to regularly ferrying travelers to and from the International Space Station.

The NASA and SpaceX Crew-1 mission is scheduled to launch Saturday evening. NASA sees the mission as a major step for its commercial crew program, which aims to routinely rotate crews on and off the International Space Station, while also laying the groundwork for future missions to the moon and Mars.

Updated at 1:34 a.m. ET Monday

Tropical Storm Eta made landfall late Sunday in the Florida Keys. The southern part of the state faces a potential one-two punch from Eta, which could strengthen into a hurricane and drop up to a foot of rain before retreating to the Gulf of Mexico to gather strength for round two.

The National Hurricane Center says Eta had maximum sustained winds of 65 mph on Sunday night and was centered about 30 miles east-northeast of Marathon, Fla., and 70 miles east-northeast of Key West. It was moving west-northwest at 14 mph.

President-elect Joe Biden will have his work cut out for him.

The United States added 126,480 new coronavirus cases on Friday, according to data released Saturday by the Johns Hopkins Coronavirus Resource Center. It's the third day in a row that the U.S. has set a daily record, bringing the total number of infections in the country to more than 9.7 million. More than 236,000 have died.

Updated at 7:45 p.m. ET

President Trump is celebrating a caravan of supporters who followed a Biden-Harris campaign bus in Central Texas.

In a Saturday night tweet, the president retweeted a video showing his supporters surrounding the bus, set to Tech N9ne's "Red Kingdom." "I LOVE TEXAS!" Trump said.

The U.S. is edging ever closer to 100,000 new daily cases of the coronavirus. According to data released Saturday by Johns Hopkins University, the country added 99,321 cases and 1,030 deaths to its tally on Friday.

After your team wins the World Series, it's only natural to run onto the field to celebrate with your teammates.

But when you've been diagnosed with COVID-19 — and gotten a warning from security to leave the field — that natural instinct can lead to a "full investigation" by Major League Baseball.

Updated at 10:34 p.m. ET

Hurricane Zeta, which made landfall as a Category 2 storm in southern Louisiana, is losing intensity on its trail of destruction over the Gulf Coast.

The storm came ashore Wednesday evening in the fishing village of Cocodrie, La., before moving over New Orleans and onto to Mississippi and Alabama.

Zeta has officially strengthened into a hurricane, and is predicted to make landfall late Monday on Mexico's Yucatan Peninsula before setting its sights on the U.S.

One week after Virginia Gov. Ralph Northam opened an investigation into systemic racism at the Virginia Military Institute, the college's superintendent has submitted his resignation.

Updated Oct. 26 at 9:50 a.m. ET

A tropical storm stalled over the Caribbean Sea is poised to drop heavy rain on the U.S. Gulf Coast within the next few days. Forecasters say it is likely to move in a northwestward direction and strengthen into a hurricane by the time it hits the southern U.S. on Wednesday.

Updated at 2:24 p.m. ET

Catholics in the United States will get their first African-American cardinal next month. In a surprise announcement Sunday from his window overlooking St. Peter's Square, Pope Francis named Wilton Gregory, the archbishop of Washington, D.C., among 13 new cardinals.

Gregory will be elevated to the position in a ceremony at the Vatican on Nov. 28.

Country music singer Jerry Jeff Walker, the man behind "Mr. Bojangles," died Friday after a battle with throat cancer. He was 78.

"He was at home until an hour before his passing," his wife of 46 years, Susan Walker, told the Austin American-Statesman. "He went very peacefully, which we were extremely grateful for."

Poland's president, Andrzej Duda, is in isolation after testing positive for the coronavirus, his spokesman announced Saturday.

"The president is fine," his spokesman, Blazej Spychalski, said on Twitter. "We are in constant contact with the relevant medical services."

A Louisiana man serving a life sentence for stealing a pair of hedge clippers in 1997 was paroled on Thursday, after spending more than two decades in prison for his crime.

That act of simple burglary wouldn't normally lead to a life sentence. But over the previous two decades, Fair Wayne Bryant had committed four other felonies, including armed robbery of a cab driver, stealing merchandise from a store, forging a check for $150, and stealing property from somebody's home.

The powerful derecho that swept through the Midwest in August, focusing its destruction on central Iowa, is officially the most costly thunderstorm event in recorded U.S. history.

New Zealand Prime Minister Jacinda Ardern has won re-election in a landslide.

The win wasn't surprising; Ardern's leadership has helped New Zealand become one of the most successful countries in handling the coronavirus pandemic. Going into the election, polls showed Ardern's Labour Party with a wide lead over the nearest competitor, the conservative National Party.

Ask an infectious disease doctor whether the president still has coronavirus, and you quickly realize that "having" the virus is a concept that exists more among laypeople than doctors.

"We try to avoid that question," says Dr. Amesh Adalja, senior scholar at the Johns Hopkins Center of Health Security. "It becomes much harder to explain to people, well why is the test positive when you're saying he's not contagious? It's because, that far out, it's not viable virus."

A federal judge in Pennsylvania has thrown out a lawsuit by the Trump campaign that tried to limit the swing state's use of drop boxes in the current presidential election.

The lawsuit also challenged the Pennsylvania secretary of state's guidance that mail-in ballots shouldn't be rejected if the voter's signature doesn't match the one on file, and a state restriction that poll watchers be residents of the county where they are assigned.

Hundreds of thousands of people in the Gulf Coast are without power after Hurricane Delta made landfall in Louisiana on Friday night. The storm brought high winds and heavy rain to an area that was still recovering from the devastation caused by Hurricane Laura in August.

More than half a million power outages were reported throughout the state, representing about 25% of all customers in Louisiana, Gov. John Bel Edwards said at a press conference on Saturday.

Facing an increase in coronavirus infections in certain neighborhoods, New York City Mayor Bill de Blasio announced Sunday that he would close all nonessential businesses, public and private schools, and daycares in nine ZIP codes throughout Brooklyn and Queens, to ensure that the virus doesn't spread further.

A decades-long dispute over territory in the southern Caucasus has led to open hostilities between Azerbaijan and Armenia this past week. Azerbaijan's second-largest city, Ganja, came under attack Sunday, with government officials saying Armenia had launched missiles into residential areas. Armenia has denied the charges; the leader of the territory at the center of the dispute said his forces were responsible for the attack.

Azerbaijani officials said one civilian was killed in the attack, and 32 more were injured.

President Trump, hospitalized at Walter Reed National Military Medical Center in Maryland, is being treated with remdesivir, an antiviral drug made by Gilead Sciences.

A man has been charged with attempted murder after he fired multiple shots into a Los Angeles County sheriff's patrol vehicle earlier this month.

Deonte Lee Murray, 36, allegedly fired a handgun into the squad car as it was parked near a train station in Compton on Sept. 12. The two deputies inside were critically wounded, but were able to radio for help.