Tax hikes won't be an option to offset rebuilding funds for the Gulf Coast, President Bush said in a speech Friday.
Bush said some of the money for the monumental effort - estimated to cost $200 billion - would have to be found in cuts to other programs, though he did not offer specifics.
The post-Katrina rebuilding comes at a time when the budget deficit already is increasing.
The shortfall is expected to exceed $500 billion by 2008 and climb to $873 billion by 2015, said Brian Riedl, a federal budget analyst at the Heritage Foundation, a conservative think tank focusing on policy research and analysis.
"Katrina costs are occurring alongside runaway spending and rapidly escalating entitlement costs," Riedl said.
Some experts said Bush likely will look to trim discretionary spending.
"I think in general they'll look for crevices in the budget, and crevices are in the eye of the beholder," said George Rabinowitz, professor of political science at UNC.
"They've already cut substantially from programs that aid to poor people, and I don't think that there is that much room in those programs."
But Riedl said some projects are plainly wasteful, and cutting in those areas wouldn't be detrimental.