Susan Collins was a Senate intern in 1974 when Congress, in response to President Richard M. Nixon’s refusal to spend on projects he opposed, passed a sweeping budget law to bar presidents from overriding lawmakers when it came to doling out dollars.
The resulting law, the Congressional Budget and Impoundment Control Act, is “very clear, and it re-emphasizes the power of the purse that Congress has under the Constitution,” Ms. Collins, now a 72-year-old Republican senator from Maine and the chairwoman of the Appropriations Committee, said in an interview this week.
She and her fellow appropriators in both parties will have a fight on their hands if they hope to retain supremacy in federal spending. The question of who has the final word is emerging as a central point of contention between members of Congress and the White House, a clash that is likely to escalate after the confirmation on Thursday of Russell T. Vought as the director of President Trump’s Office of Management and Budget.
Mr. Vought has flatly declared that he — and Mr. Trump — consider the budget act to be unconstitutional. They contend that the White House can choose what gets money and what doesn’t even if it conflicts with specific directions from Congress through appropriations measures signed into law. Others on Capitol Hill, including some Republicans, vehemently dispute that idea.
The disagreement is spurring the uproar over Mr. Trump’s move to suspend trillions of dollars in federal spending while the executive branch reviews it to determine whether it complies with his newly issued policy dictates, as well as the president’s efforts to gut the United States Agency for International Development.
