From the Document: "U.S. foreign assistance provided through Department of State, Foreign Operations, and Related Programs (SFOPS) appropriations is subject to a high level of congressional input, as mandated under the Foreign Assistance Act of 1961 (FAA, P.L. 87-195), as amended. Congress works with the relevant executive agencies through a distinctive executive-congressional process to allocate assistance, especially allocations by country in Titles III and IV. The process described in this product is particular to SFOPS assistance and focuses especially on the executive branch and congressional oversight."
CRS In Focus, IF11515
Congressional Research Service: https://crsreports.congress.gov/