Coming up on today’s show:

• What are voters thinking as the Democratic convention nears? Former New Mexico Governor Bill Richardson weighs in on his candidate — Hillary Clinton — and the unexpectedly close race with U.S. Senator Bernie Sanders. 

• Though Donald Trump is winning the popular vote among Republicans, he may have to fight to keep his delegates at the GOP convention in Cleveland. One Trump delegate, former Arizona Governor Jan Brewer, explains why she’s supporting him.

• Disposable cell phones phones and new forms of technology have dramatically changed the way undocumented workers cross into the U.S. from Mexico. Brian Anderson, features editor for VICE’s tech site, Motherboard, provides an in-depth look at what it’s like to cross into the United States in 2016.

• Thousands were forced to leave their homes this week as record-breaking rainfall that slammed Houston. The flash flooding that has killed at least seven people, and inflicted millions in damage. Dave Fehling, energy and environment reporter for Houston Public Media, examines a new flood warning system that may help in the future.

• On Wednesday, Vice President Joe Biden will address the American Association for Cancer Research to discuss the details of his moonshot initiative to fight cancer. Dr. Claire Pomeroy, president of the Albert and Mary Lasker Foundation, discusses Biden’s plan to eradicate cancer. 

• The Library of Congress has re-released unique recordings from Morocco that were made in the 1959. Philip Schulyer, a retired professor of ethnomusicology at the University of Washington and editor of the new edition of “Music of Morocco,” has the details.

• Michael Goldfarb, a former NPR London correspondent, explains how Bruce Springsteen’s song “The River” became the soundtrack for the political, cultural, and economic environment driving this election season.