This week on "Face the Nation with Margaret Brennan," Minneapolis Police Chief Brian O'Hara, House Majority Leader Steve Scalise and Sen. Angus King discuss Saturday's fatal Border Patrol shooting. Plus, Canadian Ambassador to the U.S. Kirsten Hillman joins.
Martin was tapped to lead the Weaponization Working Group after he failed to win enough support from the Senate to be confirmed as D.C.'s U.S. attorney.
