Camila Domonoske

One of NASCAR's most popular drivers — and one of its most famous names — is leaving the racetrack. Dale Earnhardt Jr. announced Tuesday that he's retiring at the end of the season.

Earnhardt recently took a long break to recover from a series of concussions.

Just a few weeks ago, he told NPR he wasn't sure when he'd be leaving the sport.

Updated 3:40 p.m. ET

Senior lawmakers on the House Oversight Committee say Michael Flynn, the former national security adviser, appears to have violated the law when he took payments from groups associated with foreign governments.

Chairman Jason Chaffetz, R-Utah, and ranking member Elijah Cummings, D-Md., spoke at a news conference Tuesday, after they received a classified briefing.

"I see no data to support the notion that Gen. Flynn complied with the law," Chaffetz said.

Two Obama administration officials will testify in an open hearing before the House Intelligence Committee as part of ongoing investigations into Russian meddling in the 2016 presidential election.

The U.S. intelligence community has concluded that Russia attempted to help Donald Trump win the election. Investigations by the House, Senate and FBI are examining what exactly Russia did and whether the Trump campaign was involved, among other questions.

Robert Siegel, whose career with NPR has spanned more than four decades, will be stepping down as co-host of NPR's All Things Considered next year.

One of the most distinctive voices on NPR's airwaves, Siegel will be leaving the host's chair in January 2018. He has hosted the show for 30 years.

The U.S. Treasury Department has announced sanctions on 271 individuals it says are scientists working on weapons development for Syrian President Bashar Assad.

The new sanctions are a response to the deadly April 4 chemical attack in Khan Shaykhun, an attack the U.S. government accuses Assad of carrying out against civilians.

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