Director of National Intelligence Tulsi Gabbard, the highest-ranking intelligence official in the U.S. government, has resigned. She said her husband is suffering from a rare bone cancer that requires her full attention. Nick Schifrin and Liz Landers report, and William Brangham discusses more with Larry Pfeiffer.

The countries along NATO's eastern flank have long been on the frontline against Russian aggression. But now they are in the firing line between Ukraine's long-range drones and targets in northwest Russia. Nick Schifrin spoke with Latvia's foreign minister and reports on NATO's efforts to defend itself against a growing drone threat.