The Power of the Purse

- Wikipedia: The Power of the Purse. 

The power of the purse is the ability of one group to control the actions of another group by withholding funding, or putting stipulations on the use of funds. The power of the purse can be used positively (e.g. awarding extra funding to programs that reach certain benchmarks) or negatively (e.g. removing funding for a department or program, effectively eliminating it). The power of the purse is most often utilized by forces within a government that do not have direct executive power, but have control over budgets and taxation.

. . . In the federal government of the United States, the power of the purse is vested in the Congress as laid down in the Constitution of the United States, Article I, Section 9, Clause 7 (the Appropriations Clause) and Article I, Section 8, Clause 1 (the Taxing and Spending Clause).

The power of the purse plays a critical role in the relationship of the United States Congress and the President of the United States, and has been the main historic tool by which Congress has limited executive power. One of the most prominent examples is the Foreign Assistance Act of 1974, which eliminated all military funding for the government of South Vietnam and thereby ended the Vietnam War.

. . . The power of the purse has also been used to compel the U.S. states to pass laws, in cases where Congress does not have the desire or constitutional power to make it a federal matter. The most well-known example of this is regarding the drinking age, where Congress passed a law to withhold 10% of federal funds for highways in any state that did not raise the age to 21. The law was upheld by the U.S. Supreme Court in the South Dakota v. Dole case. Congress was not allowed to change the drinking age directly because the 21st Amendment (which ended Prohibition in the U.S.) gave control of alcohol to the states. In 2009, Congress considered similar legislation regarding texting while driving.

This power was curtailed somewhat in a case regarding the Affordable Care Act, in which the Supreme Court ruled in June 2012 that the law's withholding of all existing Medicaid funding for states that failed or refused to expand their Medicaid programs to cover the uninsured poor was "unduly coercive", despite the fact that the federal government would pay the entirety of the states' expansion for the first years, and 90% thereafter. It was left unclear what percentage would be considered acceptable.

- Reforming Congress's Power of the Purse.

- The power of the purse: How appropriators have outsized influence in shaping policy.