6 U.S. Code § 347 - Quadrennial homeland security review
In fiscal year 2009, and every 4 years thereafter, the Secretary shall conduct a review of the homeland security of the Nation (in this section referred to as a “quadrennial homeland security review”).
Each quadrennial homeland security review shall be a comprehensive examination of the homeland security strategy of the Nation, including recommendations regarding the long-term strategy and priorities of the Nation for homeland security and guidance on the programs, assets, capabilities, budget, policies, and authorities of the Department.
The Secretary shall ensure that each review conducted under this section is coordinated with the Future Years Homeland Security Program required under section 454 of this title.
Not later than December 31 of the year in which a quadrennial homeland security review is conducted, the Secretary shall submit to Congress a report regarding that quadrennial homeland security review.
There are authorized to be appropriated such sums as may be necessary to carry out this section.