Lawrence: Trump decides to put the nation in a constitutional crisis as Xi Jinping visits

Tonight on The Last Word: MS NOW and CNN are blocked from a White House event. Also, a Trump loyalist scrubs Donald Trump from his Florida governor campaign website. And ProPublica responds to Sen. Susan Collins calling their report a “hit job.” Laurence Tribe, David Jolly, and Avi Asher-Schapiro join Lawrence O’Donnell.