House Republicans on Monday released their long-awaited plan for unravelling former President Barack Obama's health care law, a package that would scale back the government's role in health care and likely leave more Americans uninsured.

House committees planned to begin voting on the 123-page legislation on Wednesday, launching what could be the year's defining battle in Congress and capping a seven-year Republican effort to repeal the 2010 law. Though GOP leaders expect their measure to win the backing of the Trump administration, divisions remain and GOP success is by no means ensured.

The plan would repeal the statute's unpopular fines on people who don't carry health insurance. It would replace income-based subsidies the law provides to help millions of Americans pay premiums with age-based tax credits that may be less generous to people with low incomes.

Those payments would phase out for higher-earning people.