The bill to replace the Affordable Care Act narrowly passed the House on Thursday.

After a series of last-minute amendments to appease both moderate and conservative Republican lawmakers, the GOP garnered the necessary support to pass the proposal. It now goes to a much more skeptical Senate, where Republicans hold a narrower majority.

Democrats have slammed Republicans for pushing for a vote without an assessment of its costs from the nonpartisan Congressional Budget Office. The party has warned about a previous CBO estimate that showed an earlier version of the plan leading to 24 million more uninsured people over a decade and rising premium costs for older Americans.

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