How does law enforcement handle the most powerful person in the country? And should Special Counsel Robert Mueller have wide-ranging power to investigate wrongdoing by the president?We put those questions to Pulitzer Prize-winning author Tim Weiner, whose work inspired the new Showtime documentary series "Enemies: The President, Justice & the FBI."Want to support 1A? Give to your local public radio station and subscribe to our podcast. Have questions? Find us on Twitter @1a.