In the Close Up: The rhetoric is rising between Washington and Tehran. U.S. officials clearly assigning blame on Iran for a recent attack on two tankers and some fear the situation could escalate. The FBI says the man who was killed in a shootout at a federal courthouse in Dallas was an Army veteran who was carrying more than five 30-round magazines and a high-powered rifle.  Kevin Carr reviews the latest season the of the Netflix show “Black Mirror”.   And the U.S. is sending 1000 troops to the Middle East. Michael asks listeners if a military build up to put pressure on Iran is the right path.