Beto O'Rourke announces that he will run for president. Plus, the Senate votes to block Trump's national emergency declaration that would give him the money for his wall. This episode: political editor Domenico Montanaro, political reporter Danielle Kurtzleben, editor correspondent Ron Elving, national political correspondent Mara Liasson, and Congressional correspondent Sue Davis. Email the show at nprpolitics@npr.org. Find and support your local public radio station at npr.org/stations.