Lawrence: Republicans don't want you to know the truth about TX school massacre

Tonight on the Last Word: Texas Police change the story on their engagement with the shooter. Also, students stage walkouts nationwide to demand gun reform. Plus, studies show that shootings with high-capacity magazines have higher death tolls. And The New York Times reports that Donald Trump reacted “approvingly” to chants about hanging Mike Pence on January 6th. Ken Dilanian, Jim Cavanaugh, TX State Rep. Chris Turner, MI State Sen. Mallory McMorrow, Rep. Abigail Spanberger and Daniel Goldman join Lawrence O’Donnell.