Republicans on Capitol Hill are grappling with the likelihood that they will need Democratic support to pass parts of any plan replacing the Affordable Care Act, setting up a complex legislative battle over the law’s future.

President-elect Donald Trump is expected in his first days in office to take executive action voiding parts of the health law that the administration has discretion to change. Soon after that, lawmakers likely would start on their efforts to repeal and replace the law.

With full control of Congress and the White House, Republicans have anticipated being able to repeal the law using a special budget maneuver that would allow them to get around a filibuster by Democrats in the Senate.

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