Analysis from the nonpartisan Congressional Budget Office found that Republicans’ new version of the legislation would make far deeper cuts and lead to more people becoming uninsured than previous proposals.

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Instead of directly reducing benefits for the poor, Republicans are making them harder to get and to keep.

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Republican leaders barely scaled a key procedural hurdle to bring up the bill, but Democrats delayed its consideration and it was unclear whether the G.O.P. had the votes to pass it.

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The Republicans’ big bill would require most states to build technology systems quickly and with little funding.

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