NPR Staff

Donald Trump's Republican presidential campaign continues to lead in the polls, and this week Trump hired Sam Clovis to be his national campaign co-chairman. A week ago, Clovis worked for Republican rival Rick Perry. Clovis, a former radio talk show host and college professor, is an Iowan who has run for state treasurer and the U.S. Senate there. He Talked to NPR's Scott Simon from Sioux City, Iowa.

To hear the full conversation, click the audio link above.

Interview Highlights

On why he left Perry to work for Trump

The big price drops on Wall Street in recent days have had many people worried. We asked people on social media to send us some questions about the stock market volatility and we turned to economist Austan Goolsbee for answers.

The U.S. has around 800 military bases outside of the nation's borders. They're home to hundreds of thousands of troops and family members, and, in many cases, they're a cause of controversy.

David Vine, an associate professor of anthropology at American University, argues that we've become too dependent on such overseas bases — and that many of them cause serious opposition abroad. He lays out his thinking in his new book, Base Nation: How the U.S. Military Bases Abroad Harm America and the World.

Marion, Ohio, just north of Columbus, used to be an idyllic place to grow up.

Kelly Clixby and Beth Carey remember what it was like a generation ago, when they were young.

"I lived across the street from one of the big parks here," Clixby says. "We would rip n' run all day and all night and come in when the street lights were on."

"It was just a nice place to live," Carey says.

Today, Marion is different. It's grappling with a full-blown heroin epidemic, one that derailed Kelly Clixby's life and killed Beth Carey's twin sister.

In 1998, Ben Lecomte swam across the Atlantic Ocean. The 47-year-old athlete is preparing for another historic plunge: swimming across the ocean on the other side of the country.

At the end of September, Lecomte plans to take off from a Tokyo beach and spend the next six months making his way some 5,500 miles across the Pacific Ocean to San Francisco.

He'll swim for eight hours a day, then board a support boat to eat and sleep. The next day he'll jump back in the water at the exact same spot.

To hear the full conversation, click the audio link above.