Nation

Follow PBS NewsHour’s complete coverage of U.S. news, reports and analysis.

Monday on the NewsHour, mourning for the victims of Sunday’s mass shooting at a Florida gay nightclub gives way to tough questions about what the feds knew about gunman Omar Mateen. Also: How counterterror experts battle domestic threats, lawmakers react…

How do intelligence and law enforcement agencies investigate and prevent domestic terror attacks like the Orlando shooting? Judy Woodruff talks to former National Counterterrorism Center Director Michael Leiter and former FBI terrorism investigator Ali Soufan for some perspective on national…