Secretary of State Mike Pompeo made a sudden, unscheduled trip to Baghdad on Tuesday, as an aircraft carrier and Air Force bombers headed to the Middle East amid warnings that Iran was contemplating an attack on U.S. troops in the region. The surprise visit came after Pompeo abruptly canceled a trip to Germany, where he was scheduled to meet with Chancellor Angela Merkel and Foreign Minister Heiko Maas. The State Department initially said only that the change was made because “pressing issues” had arisen. Pompeo’s visit to Baghdad, which followed an Arctic Council meeting in Finland, took on an air...