U.S. missile defense system "accurate" but "not foolproof"

U.S. missile defense system “accurate” but “not foolproof”
Douglas Ollivant is a senior fellow at New America Foundation and a former director at the National Security Council. He joins “CBS This Morning: Saturday” from Washington to discuss the escalating tension on the Korean peninsula, the effectiveness of the U.S. missile defense system and President Trump’s comments that he isn’t ruling out military options in Venezuela.