It wasn't clear why the Defense secretary issued the order not to send troops on a routine mission to a country the administration refers to as a "model ally."
German lawmaker Roderich Kiesewetter acknowledged tense relations between Berlin and Washington but argued German leaders could have done a better job of calibrating their criticisms of the Iran war.
The Senate Armed Services member and former Pentagon official warned the president could easily fall into a trap due to his eagerness to strike a deal with China.