WASHINGTON — President Obama suggested Monday that he was not comfortable with abortion restrictions inserted into the House version of major health care legislation, and he prodded Congress to revise them.

“There needs to be some more work before we get to the point where we’re not changing the status quo” on abortion, Mr. Obama said in an interview with ABC News. “And that’s the goal.”

On the one hand, Mr. Obama said, “we’re not looking to change what is the principle that has been in place for a very long time, which is federal dollars are not used to subsidize abortions.”

On the other hand, he said, he wanted to make sure “we’re not restricting women’s insurance choices,” because he had promised that “if you’re happy and satisfied with the insurance that you have, it’s not going to change.”

Before passing its health bill on Saturday, the House adopted an amendment that would block the use of federal money for “any health plan that includes coverage of abortion,” except in the case of rape or incest or if the life of a pregnant woman is in danger.

Some private insurance now covers abortion. Under the bill, most private insurers would receive federal subsidies on behalf of low- and middle-income people.

The Senate is working on its own version of health legislation.

Senator Susan Collins, a Maine Republican and pivotal centrist courted by the White House, delivered a blistering critique of the Senate bill on Monday, saying she could not support it because it would increase insurance costs for many middle-income families and small businesses.

“We should rewrite the whole bill,” Ms. Collins said. “There is considerable unease on both sides of the aisle about the impact of this bill, and as more analysis is done, I believe those concerns will only grow.”

Ms. Collins and the other Maine senator, Olympia J. Snowe, are among the few Republicans who had been considered potential supporters of the bill, drafted mainly by Senate Democrats with help from the White House.

Ms. Collins appeared to dash those hopes on Monday, even as she affirmed her belief that Democrats and Republicans could still find significant areas of agreement.

Summarizing her study of the bill over the past 10 weeks, Ms. Collins said it was “too timid” in revamping the health care system to reward high-quality care. She said the bill included “billions of dollars in new taxes and fees that will drive up the cost of health insurance premiums.”

And she noted that many of the taxes would take effect before the government started providing subsidies to low- and middle-income people to help them buy insurance.

Thus, Ms. Collins said, “there will be a gap for even low-income people where the effect of these fees will be passed on to consumers and increase premiums before any subsidies are available to offset those costs.”

The bill sets standards for the value of insurance policies, stipulating that they must cover at least 65 percent of medical costs, on average.

Most policies sold in the individual insurance market in Maine do not meet those standards, Ms. Collins said, so many insurers would have to raise premiums to comply with the requirements. As a result, she said, the premium for a 40-year-old buying the most popular individual insurance policy in Maine would more than double, to $455 a month.

The chairman of the Senate Finance Committee, Max Baucus, Democrat of Montana, has tried to answer such criticism, saying that many of the current policies provided meager bare-bones coverage.

The Senate Democratic leader, Harry Reid of Nevada, has drafted a health bill that he hopes to take to the Senate floor within weeks. He is waiting for a cost analysis by the Congressional Budget Office.

Supporters of the Senate bill said they believed that their efforts would gain momentum from the approval of a broadly similar bill in the House on Saturday by a vote of 220 to 215. But Representative Robert E. Andrews, Democrat of New Jersey and an architect of the House bill, said, “The hardest part is still ahead of us.”

The House and Senate bills differ in at least five ways: how to configure a new government insurance plan; whether to require employers to provide coverage to employees; whether to finance the legislation with a tax on high-income people or a tax on high-cost insurance plans; how strictly to limit coverage of abortion; and whether illegal immigrants should have access to new insurance marts, or exchanges.

The House bill imposes more stringent restrictions on the coverage of abortion.

Ms. Collins said the Senate Finance Committee “did a good job of putting up a firewall that would prevent federal funds from being used to finance abortions.” But she added, “If Congress makes the mistake of establishing a new government-owned insurance company, it would need to extend the prohibition to that company because it is using federal funds.”