Sen. Bob Corker (R-Tenn.), a key holdout on the Republican tax bill, says a proposal to establish a trigger pulling back tax cuts in case economic projects fall short hasn’t been resolved. The lack of an agreement puts the votes of Corker and at least two other deficit hawks, Sens. Jeff Flake (R-Ariz.) and James Lankford (R-Okla.), in jeopardy. Asked if there was agreement on the trigger, Corker replied, “no.” “An offer has been made and we’re dealing with it and other issues,” Corker said. The proposal under discussion would rollback tax relief and raise about $350 billion over 10...