Congress and the War in Yemen: Oversight and Legislation 2015-2019 [Updated September 6, 2019] [open pdf - 1MB]
From the Summary: "This CRS [Congressional Research Service] report provides an overview of the role Congress has played in shaping U.S. policy toward the conflict in Yemen, with summary tables providing information on various legislative proposals considered in the 114th , 115th , and 116th Congresses. These proposals have reflected a range of congressional perspectives and priorities, including  the authorization of the activities of the U.S. Armed Forces related to the conflict;  the extent of U.S. logistical, material, advisory, and intelligence support for the coalition led by Saudi Arabia;  the approval, disapproval, or conditioning of U.S. arms sales to Saudi Arabia;  the appropriation of funds for U.S. operations in support of the Saudi-led coalition;  the conduct of the Saudi-led coalition's air campaign and its adherence to international humanitarian law and the laws of armed conflict;  the demand for greater humanitarian access to Yemen;  the call for a wider government assessment of U.S. policy toward Yemen and U.S. support to parties to the conflict;  the nature and extent of U.S.-Saudi counterterrorism and border security cooperation; and  the role of Iran in supplying missile technology and other weapons to the forces of the Houthi movement."
CRS Report for Congress, R45046
Congressional Research Service: https://crsreports.congress.gov/