(Bloomberg) — U.S. antitrust enforcers roundly rejected a pair of proposed deals that would consolidate the nation's five biggest health insurers into just three.

The Justice Department filed an antitrust lawsuit to stop Anthem Inc.'s merger with Cigna Corp. in federal court in Washington on Thursday and also moved to block Aetna Inc.'s planned merger with Humana Inc.

Eight states including Florida and Illinois, plus the District of Columbia, are joining the federal government's suit to block the Aetna-Humana deal.

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