(Bloomberg) -- The Senate parliamentarian told lawmakers that Republicans’ ability to pass an Obamacare replacement with just 51 votes expires at the end of this month, Senator Bernie Sanders said Friday.

The preliminary finding complicates any further efforts by Republican leaders in Congress to pass a comprehensive GOP-only replacement for the health-care law.

Sanders, a Vermont independent, in a statement called the determination a "major victory" for those who oppose repealing Obamacare.

Senate Republicans, who control the chamber 52-48, failed to win enough support for their Affordable Care Act replacement in July as three GOP lawmakers joined Democrats to oppose the measure. Republican leaders haven’t ruled out reviving their effort, and some party members -- including Lindsey Graham of South Carolina, Bill Cassidy of Louisiana and Ted Cruz of Texas -- say they’re talking to colleagues about a possible broad-based bill.

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