H.R. 3454 strengthens congressional control over federal spending by amending the 1974 Congressional Budget and Impoundment Control Act to allow private citizens and state and local governments to sue the federal government and individual officials if the president unlawfully withholds or fails to spend money that Congress has appropriated. The bill creates a private right of action in federal courts, allowing affected parties to seek injunctions to force the release of funds and to recover damages, including compensatory and punitive damages (with triple damages for bad faith violations) plus attorney's fees. Federal employees, including political appointees and senior officials, can be held personally liable for knowing violations and lose immunity protections when violating the law. The legislation clarifies that "contingencies" justifying fund withholding must be truly unforeseen events, grants the Government Accountability Office authority to interpret and enforce the law with substantial deference, and establishes that disputes over improper withholding are justiciable legal questions for courts rather than political matters left to executive discretion.