premise: "Defences do something terrible to us as well as to our real and imagined enemies," he said.
  Williams's sermon comes after a visit to the West Bank town of Bethlehem -- a place of pilgrimage for Christians because of its significance as the birthplace of Jesus -- to see at firsthand the lives of ordinary Palestinians.
  During the trip, he described the Israeli-built security barrier that surrounds the town as symbolising what was "deeply wrong in the human heart".
  On Saturday, he launched a strongly worded attack in The Times newspaper against Britain and its allies' "short-sighted" and "ignorant" policy in Iraq, which he said was putting Christians in the Middle East at risk.
  He warned that Christians could be chased out of the region because they were now being viewed by their countrymen as "supporters of the crusading West".
   What specific trip does "During the trip" refer to?
hypothesis: a visit to the West Bank town of Bethlehem