With all the pitfalls President Bush has navigated in five tumultuous years, the one worry he has rarely confronted is rebellion in his own ranks. But House Republicans, his rock, are increasingly restive about the effect that the president’s expansive plans for rebuilding the Gulf Coast could have on the nation’s already massive budget deficits. Rep. Mike Pence (R-Ind.), the prematurely white-haired leader of the House conservative caucus, set the stage for a tense week for the two ends of Pennsylvania Avenue when he declared Sunday on ABC’s “This Week” that to offset the cost of Katrina relief, “We've got...