Sen. Bernie Sanders has made it known that Donald Trump should not go unchallenged by his congressional colleagues as troubling comments by the President-elect about nuclear weapons this week sparked alarm across the United States and the world. Following an initial out-of-the-blue tweet Thursday saying the U.S. should “expand” its nuclear arsenal followed by “clarifying” remarks Friday to MSNBC in which Trump said, ” Let it be an arms race ,” Sanders responded: “It’s a miracle a nuclear weapon hasn’t been used in war since 1945.