It had all been going so well.
Prime Minister Theresa May of Britain had just left Washington on Friday evening after a tense but successful first visit with President Trump for a 10-hour flight to Ankara, Turkey, for her next awkward encounter, with the increasingly autocratic Turkish president, Recep Tayyip Erdogan.
By the time she had landed in Turkey, however, Mr. Trump had signed his executive order halting entrance to the United States of all Syrian refugees and of most citizens from seven predominantly Muslim countries. Mrs. May was beginning to feel the backlash.
After she termed the executive order an American issue,