Conservatives in the House hope to revive the failed effort to gut the Affordable Care Act with a long-shot drive to force Speaker Paul D. Ryan (R-Wis.) to hold a vote to simply repeal the health-care law without a replacement. Members of the conservative House Freedom Caucus want to seize control of the health-care debate by petitioning Republicans to hold a vote on a version of a repeal bill that passed the House in 2015.

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