The White House and Congress continue their standoff over whether or not members of the Trump administration will testify before committees. Plus, to celebrate 500 episodes, the crew looks back on key political moments. This episode: White House correspondent Tamara Keith, Congressional correspondent Scott Detrow, Congressional correspondent Susan Davis, national political correspondent Mara Liasson, political reporter Tim Mak, political reporter Asma Khalid, and editor correspondent Ron Elving. Email the show at nprpolitics@npr.org. Find and support your local public radio station at npr.org/stations.