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But White House officials expect the House to vote on the Senate bill and a package of repairs this week, before Mr. Obama leaves Sunday for an international trip.

The repair bill would then move to the Senate, where Democrats plan to pass it through reconciliation, a complicated procedural tool that only needs 51 votes and eliminates the chance of a Republican filibuster.

Republican lawmakers, citing prolonged public opposition to the overhaul, have begun accusing Mr. Obama and Democrats of pursuing a “bitter, destructive and endless” drive to pass the overhauls.

“An entire year has gone to waste,” Sen. Scott Brown said in the weekly GOP radio and Internet address. “Millions of Americans have lost their jobs, and many more jobs are in danger. Even now, the president still hasn’t gotten the message.

“Somehow, the greater the public opposition to the health care bill, the more determined they seem to force it on us anyway.”

Mr. Brown himself can claim responsibility for the Democrats’ failure to pass health overhaul legislation to date. They were on the verge of doing so before Mr. Brown claimed the late Edward M. Kennedy’s Senate seat in a special election upset in Massachusetts in January, depriving Democrats of their filibuster-proof supermajority and throwing the health care effort into limbo.

Public polls suggest that the majority of Americans are opposed to the sweeping legislation, which would extend coverage to some 30 million uninsured Americans with a new mandate for nearly everyone to carry insurance.

House Minority Leader John A. Boehner of Ohio pledged on CNN’s “State of the Union” that Republicans are “going to do everything we can to make it difficult for them, if not impossible, to pass the bill.”

White House spokesman Robert Gibbs predicted on “Fox News Sunday” that Democrats would have the votes within a week. Mr. Obama plans to visit Ohio on Monday to continue to push for passage of the plan.

This article is based in part on wire service reports.