The Obama administration on Tuesday starkly warned Republicans against a "repeal-and-delay" strategy on Obamacare as it announced that more than 11.5 million Americans have signed up for health insurance coverage on government-run marketplaces this enrollment season — a slight increase from last year.

Giving Medicare authority to negotiate drug prices is the best way to keep those spiraling costs under control for the program’s recipients, departing Health and Human Services Secretary Sylvia Burwell said Monday.

Republicans eager to scrap the 2010 health-care law are wrestling with whether to immediately cut off the tax revenue it brings in.

The Republican strategy of repealing the Affordable Health Care Act before devising a replacement plan has the support of only one in five Americans, a poll released Friday finds.

By nearly any measure, Obamacare has failed: It didn’t lower costs, it didn’t increase choice, middle-class families continue to lose health plans they were promised they could keep, and Americans continue to call for Obamacare’s repeal.

Republicans will work on unraveling and replacing the health care law at the same time, House Speaker Paul Ryan said Tuesday as GOP leaders struggled to align their zeal to rapidly erase one of President Barack Obama's proudest achievements with Congress' legislative and political pitfalls.