The mayor and council adopt a local budget, which must be approved by Congress. Local income, sales, and property taxes provide about 67% of the revenue to fund city government agencies and services. Like the 50 states, D.C. receives federal grants for assistance programs such as Medicare, accounting for approximately 26% of the city's total revenue. Congress also appropriates money to the District's government to help offset some of the city's security costs; these funds totaled $38 million in 2007, approximately 0.5% of the District's budget.[146] The Federal government operates the District's court system,[147] and all federal law enforcement agencies, most visibly the U.S. Park Police, have jurisdiction in the city and help provide security as well.[148] All local felony charges are prosecuted by the United States Attorney for the District of Columbia.[149] U.S. Attorneys are appointed by the President and funded by the United States Department of Justice.[150] In total, the federal government provided about 33% of the District's general revenue.[151] On average, federal funds formed about 30% the states' general revenues in 2007.[152]