TERRY GROSS, HOST:

This is FRESH AIR. I'm Terry Gross. Two of the people under investigation by Robert Mueller - Roger Stone and Jerome Corsi - are conspiracy theorists who believe the deep state is trying to take over America.

Jeffrey Toobin is a staff writer for The New Yorker. He talks about Roger Stone, who has been indicted in the Mueller investigation, and conspiracy theorist Jerome Corsi - two men Toobin says have influenced Trump's world view, and whose cases will help determine the outcome of the clash between the special counsel and The president.

The documentary series Surviving R Kelly features interviews with women who allege the R&B singer R Kelly sexually and physically abused them, and it examines how the music industry and fans protected him.

Former FBI Deputy Director Andrew McCabe says it's not normal for the bureau to open investigations into the president.

"We don't have a lot of experience with investigating presidents of the United States," McCabe says.