The 99th United States Congress convened from January 3, 1985, to January 3, 1987. It consisted of the Senate and the House of Representatives, with a total of 535 members. The Republican Party held a majority in both chambers during this session, which was marked by significant legislative activity. Key legislation passed during the 99th Congress included the Tax Reform Act of 1986, which aimed to simplify the tax code, and the Immigration Reform and Control Act, which addressed illegal immigration. The Congress also focused on issues such as national defense and economic policy during this period.