The announcement on Tuesday comes at a time of extreme uncertainty about the future of the U.S. health care system. A Republican plan to unwind key pieces of Obama's law failed in the U.S. Senate last week, but President Donald Trump has repeatedly urged lawmakers to keep working on it.
Trump has threatened to end payments that insurance companies receive to keep down out-of-pocket costs for lower-income consumers.
Covered California, the state's health exchange, warned earlier this year that monthly premiums would likely rise significantly if insurers worry that those payments won't be guaranteed in 2018.
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