The Obama administration faced a fresh challenge to its health-care law just as many of its key provisions took effect Wednesday, after an eleventh-hour Supreme Court ruling temporarily allowed some Catholic groups not to cover birth control in their employee health plans.

The requirement that employers cover contraception and related medications and procedures has been one of the most controversial parts of the Affordable Care Act, leading to dozens of lawsuits from groups that say it violates their religious freedom. The Supreme Court will hear arguments on the issue this year.

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