Congress periodically establishes agricultural and food policy in an omnibus farm bill. The 115th Congress faces reauthorization of the 2014 farm bill--the Agricultural Act of 2014 (P.L. 113-79, H.Rept. 113-333)--because many of its provisions expire in 2018. The 2014 farm bill is the most recent omnibus farm bill. It was enacted in February 2014 and succeeded the Food, Conservation, and Energy Act of 2008 (P.L. 110-246, "2008 farm bill"). In recent decades, the breadth of farm bills has steadily grown to include new and expanding food and agricultural interests. The 2014 farm bill contains 12 titles encompassing farm commodity revenue supports, farm credit, trade, agricultural conservation, research, rural development, energy, and foreign and domestic food programs, among other programs. Provisions in the 2014 farm bill reshaped the structure of farm commodity support, expanded crop insurance coverage, consolidated conservation programs, reauthorized and revised nutrition assistance, and extended authority to appropriate funds for many U.S. Department of Agriculture (USDA) discretionary programs through FY2018. When the 2014 farm bill was enacted, the Congressional Budget Office (CBO) estimated that the total cost of mandatory programs would be $489 billion over the five years FY2014-FY2018. Four titles accounted for 99% ($483.8 billion) of anticipated farm bill mandatory program outlays: nutrition, crop insurance, conservation, and farm commodity support. The nutrition title, which includes the Supplemental Nutrition Assistance Program (SNAP), comprised 80% of the total, with the remaining 20% mostly geared toward agricultural production across other titles. Traditionally, a primary focus of omnibus farm bills has been commodity-based revenue support policy--namely, the methods and levels of federal support provided to agricultural producers. The 2014 farm bill amended U.S. farm safety net programs by expanding crop insurance provisions and modifying counter-cyclical support while eliminating direct payments to growers of grains, cotton, and peanuts. Upland cotton was removed from eligibility for participation in the new revenue support programs as part of compliance with a World Trade Organization dispute settlement case with Brazil. Instead, cotton producers were offered an insurance-like support program that protects against within-season revenue shortfalls. Another major change involved dairy: Previous support programs were replaced with a new insurance-like margin program that insures against shortfalls in the difference between milk prices and feed costs. Most farm program proponents agree that the new cotton and dairy programs have performed ineffectively and are likely to see proposals for change. Other farm interest groups, however, continue to point to competing policy priorities--covering a range of equity concerns across the entire farm sector--and call for enhanced support for small and medium-sized farms, specialty crops, organic agriculture, local and regional food systems, healthy and nutritious foods, research, conservation, and rural development, among others. One of the principal drivers of a new farm bill debate will be the federal budget. According to CBO estimates, if ongoing programs were to continue under current law, mandatory farm bill spending by the four largest titles--nutrition, crop insurance, farm commodity programs, and conservation--are projected to be about $435 billion over the next five years (FY2018-FY2022), with domestic nutrition assistance accounting for nearly 77% of the total. This compares with actual costs for the first three years of the 2014 farm bill and projections for its last two years, which suggest that these four titles may cost $456 billion over FY2014-FY2018. [ABSTRACT FROM AUTHOR]