1.   He has hunkered down some since a speech a month ago in Jackson Hole, Wyo., opened this touchy debate.

2.   The phenomenon is opening up a touchy debate about whether Europeans should relax some of their strict immigration policies.

3.   The cost-benefit analysis, published today in the New England Journal of Medicine, sharpens an already touchy medical debate.

4.   The report could become important in a touchy debate over whether the United States should sell Taiwan four sophisticated Aegis guided-missile destroyers and other advanced military equipment.