Today on "Meet the Press," Wisconsin Republican Sen. Ron Johnson discusses the border wall national emergency, New York City Democratic Mayor Bill de Blasio criticizes Amazon for pulling out of its deal with the city and Democratic National Committee Chairman Tom Perez preview the upcoming presidential primary debates. The Cook Political Report national editor Amy Walter, Princeton University professor Eddie Glaude, Jr., Politico national political reporter Eliana Johnson and National Review senior editor Jonah Goldberg join the panel.