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Mr. Obama will deliver a broader plan Monday with ideas for where the supercommittee might find some of the savings it has been charged with recommending.

The White House said it will be up to Congress whether to substitute those ideas for the tax increases he proposed in his job-stimulus plan.

Interest groups said they feared calls from some of the committee’s members to consider paring back entitlement programs.

“Repeated statements that these programs are the primary drivers of our current debt, contrary to the facts, do a disservice to the process and impede finding real solutions to the real problems,” said Max Richtman, president of the National Committee to Preserve Social Security and Medicare.

But Mr. Elmendorf repeatedly pointed to those programs as the key difference in future budgets and debt.

“There is no way to simultaneously let Social Security and major health care programs grow the way they would under current policies, or anything close to that, and operate the rest of the federal government in line with its role in the economy over the past 40 years, and keep revenues the same share of [gross domestic product] they’ve been on average in the past 40 years,” he said.

Mr. Elmendorf poured cold water on the hope to squeeze considerable money out of fraudulent or improper payments, saying some of those would be made anyway and others are tough to do.

“There is no evidence that suggests that this sort of effort can represent the large share of the $1.2 [trillion] or $1.5 [trillion] or the larger numbers some of you have discussed in being the objective in savings for this committee,” he said.

He also said selling unused government property could raise some revenue but would not make a big dent in deficits.