Among the most expensive pieces of legislation in years, the Republican legislation could reshape the country’s finances for a generation.

WASHINGTON — Republican Sen. Thom Tillis of North Carolina said Sunday he will not seek reelection next year, an abrupt announcement that came one day after he staked out his opposition to President Donald Trump’s tax breaks and spending cuts package because of its reductions to health care programs.

The changes made to President Donald Trump’s big tax bill in the Senate would pile trillions onto the nation’s debt load while resulting in even steeper losses in health care coverage, the nonpartisan Congressional Budget Office said in a new analysis,