(REUTERS) California’s new health exchange will not allow canceled policies to extend past the end of the year, defying President Barack Obama’s effort to repair his pledge that people can keep their current plans.

The announcement on Thursday by the most populous U.S. state, an early supporter of Obama’s Affordable Care Act, marked the latest state to reject the president’s fix, which he announced last week after taking political fire for not keeping his promise to allow people to keep their plans if they like them.

Several million people stand to have their individual health insurance canceled at some point in 2014 because their plans do not comply with new requirements, such as coverage for mental health treatment and maternity care.

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