AP

Mar. 24: Senate Majority Leader Harry Reid and other Democrats speak at a health care news conference on Capitol Hill.

WASHINGTON -- Senate Republicans learned early Thursday that they will be able to kill language in a measure altering President Barack Obama's newly enacted health care overhaul, meaning the bill will have to return to the House for final congressional approval.

It was initially unclear how much of a problem this posed for Democrats hoping to rush the bill to Obama and avoid further congressional votes on what has been a politically painful ordeal for the party. Democrats described the situation as a minor glitch, but did not rule out that Republicans might be able to remove additional sections of the bill.

The president, who signed the landmark legislation into law on Tuesday, was flying to Iowa later in the day for the first of many appearances he will make around the country before the fall congressional elections to sell his health care revamp.

Obama was appearing in Iowa City, where as a presidential candidate in 2007 he touted his ideas for health coverage for all. His trip comes with polls showing people are divided over the law he signed Tuesday, and Democratic lawmakers from competitive districts hoping he can convince more voters by November that it was the right move.

As an exhausted Senate labored past 2 a.m. on a stack of GOP amendments, Jim Manley, spokesman for Senate Majority Leader Harry Reid, told reporters that Republicans consulting with the chamber's parliamentarian had found "two minor provisions" that violate Congress' budget rules. The provisions deal with Pell grants for low-income students.

Republicans have been hunting for such violations in hopes of bringing down the legislation. Democrats had also been consulting with the parliamentarian, Alan Frumin, and hoped they had written a measure that would not be vulnerable to such problems.

The two provisions are expected to be formally removed from the bill on Thursday. Manley said he expected the Senate to approve the measure without them and send it to the House. He said Senate leaders, after conversations with top House Democrats, expect the House to approve the revised measure.

The Senate scheduled passage of the health bill for Thursday afternoon. Both chambers are hoping to begin a spring recess by this weekend.

Besides reshaping parts of the landmark health overhaul, the legislation transforms the federal student loan program -- in which private banks distribute the money -- into one in which the government issues the loans directly. That produces some federal savings, which the bill uses in part to increase Pell grants to needy students.

Democratic aides said the problematic provisions deal with protecting students from future cuts in their grants if Congress does not provide enough money for them. They violate budget rules because they do not produce savings, one aide said.

The development came as the Senate completed nine hours of uninterrupted voting on 29 GOP amendments to the legislation. Majority Democrats defeated every amendment.

The legislation would change the new health care law by making drug benefits for Medicare recipients more generous by gradually closing a gap in coverage, increasing tax subsidies to help low-income people afford health care, and boosting federal Medicaid payments to states.

It kills part of the new statute uniquely giving Nebraska extra Medicaid funds -- designed to lure support from that state's Sen. Ben Nelson -- that had become a glaring embarrassment to Democrats. It also eases a new tax on expensive health coverage bitterly opposed by unions and many House Democrats, while delaying and increasing a new levy on drug makers.

As they began pushing the bill to passage on Wednesday afternoon, Democrats ran into a mountain of GOP amendments. Outnumbered and all but assured of defeat, Republicans forced votes on amendments aimed at reshaping the measure -- or at least forcing Democrats to take votes that could be used against them in TV ads in the fall campaigns.

"There's no attempt to improve the bill. There's an attempt to destroy this bill," said an exasperated Senate Majority Leader Harry Reid, D-Nev.

"The majority leader may not think we're serious about changing the bill, but we'd like to change the bill, and with a little help from our friends on the other side we could improve the bill significantly," answered Senate Minority Leader Mitch McConnell, R-Ky.

Senators voted on 29 consecutive GOP amendments between 5:30 p.m. Wednesday and 2:30 a.m. Thursday, when they recessed.

By 57-42, Democrats rejected an amendment by Sen. Tom Coburn, R-Okla., barring federal purchases of Viagra and other erectile dysfunction drugs for sex offenders. Coburn said it would save millions, while Sen. Max Baucus, D-Mont., called it "a crass political stunt."

Democrats also deflected GOP amendments rolling back the health law's Medicare cuts; killing extra Medicaid funds for Tennessee and other state-specific spending; barring tax increases for families earning under $250,000; and requiring the president and other administration officials to purchase health care from exchanges the statute creates.

The landmark legislation that Obama signed Tuesday would provide health care to 32 million uninsured people, and make coverage more affordable to millions of others by expanding the reach of Medicaid and creating new subsidies. Insurance companies would be forbidden to refuse coverage to people with pre-existing illnesses, individuals could buy policies on newly created exchanges and parents could keep children on their family plans until their 26th birthdays.

The $938 billion, 10-year price tag would be financed largely by culling savings from Medicare and imposing new taxes on higher income people and the insurance, pharmaceutical and medical device industries.