Janine Herbst

NPR's Kerry Kahn has more.

President Trump says he won't sign any bills until Congress passes the Save America Act, which requires proof of citizenship for voter registration.

NPR's Luke Garrett has more.

U.S.

futures contracts sharply lower.

Dow futures down 1.8 percent.

NASDAQ and S&P 500 futures both down 1.5 percent.

Crude oil futures are over $107 a barrel.

You're listening to NPR News.

The federal government released new dietary guidelines in January, turning the food pyramid on its head.

As NPR's Caden Mills reports, those guidelines are also used to set school nutrition standards, which means those standards may be changing soon.

A prehistoric human skeleton has been found deep inside a flooded cave system on Mexico's Caribbean coast.

Cave diving archaeologist Octavio Del Rio tells the AP the team recovered it late last year and experts are studying it now.

He says the body is far from the entrance and about 26 feet down, suggesting the cave was dry when someone placed it there, possibly as part of a burial ritual at least 8,000 years ago.

Officials say the find could add clues about early migration routes.

Mexico is working to protect the threatened caves.

I'm Janine Herbst, and you're listening to NPR News from Washington.

Live from NPR News in Washington, I'm Janine Herbst.

Iranian State TV says the country has chosen a new leader, the hardline Mushtaba Khamenei, the 56-year-old son of the slain Supreme Leader.

He has close ties with the powerful Islamic Revolutionary Guard, and his appointment signals a continuation of his father's rule and hardline stance.