The U.S. briefly closed border entries in Tijuana and used tear gas on the protesters after several migrants began approaching the border fence. The president has defended their actions. Plus, the president heads to Mississippi to rally for the Republican facing a formidable Democratic opponent. This episode: White House correspondent Tamara Keith, White House correspondent Scott Horsley, and national political correspondent Mara Liasson. Email the show at nprpolitics@npr.org. Find and support your local public radio station at npr.org/stations.