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GAO (Government Accountability Office)

An independent agency that provides auditing, evaluation, and investigative services for the U.S. Congress, often referred to as the 'congressional watchdog'.

Comptroller General

The head of the Government Accountability Office, responsible for leading its audits and investigations on behalf of Congress.

Enactment (of an Act)

The legal process by which a bill officially becomes a law after being passed by both houses of Congress and signed by the President.

Unused construction materials

Building supplies and equipment that were acquired for a project but were not ultimately incorporated into the construction or put into use.

Border wall

Physical barriers constructed along sections of the United States-Mexico border, typically comprising fences, walls, and other security infrastructure.