Failure to pass the bill in the Democratic-led House would be a major political blow to President Barack Obama who has made reforming the country's hugely expensive healthcare system a top domestic priority and wants a bill passed this year.

"I think it's going to be close," Hoyer told a small group of reporters about Saturday's vote but said that it would win majority support from Democrats.

House leaders are working through some last minute details to settle concerns by some Democrats over abortion and immigration issues.

Republicans oppose the sweeping overhaul -- which is aimed at reining in costs, expanding coverage to millions of uninsured and barring insurance practices such as denying coverage to people with pre-existing conditions. They are expected to vote against the bill in the House.

The Senate's version of a healthcare bill has been bogged down as Democratic leaders await cost estimates from congressional budget analysts and search for an approach that could win the 60 votes needed to overcome Republican procedural hurdles.

If the two chambers finally pass their bills, differences would have to be reconciled before a single reform bill would go to Obama for signature.

House Democratic leaders are trying to address concerns by some of their members who want to be sure that federal healthcare money is not spent to finance abortions.

At the same time, pro-abortion rights Democrats want to be sure that any language in the bill does not go beyond current restrictions against using federal money to finance abortions.

Some lawmakers also want to be sure illegal immigrants do not benefit from the federal subsidies for insurance premiums. Some also want to exclude illegal immigrants from accessing proposed insurance exchanges that would be established to help individuals and families find affordable insurance coverage.

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