On 15 October 1991, the parliament of the Socialist Republic of Bosnia and Herzegovina in Sarajevo passed a "Memorandum on the Sovereignty of Bosnia-Herzegovina" by a simple majority. The Memorandum was hotly contested by the Bosnian Serb members of parliament, arguing that Amendment LXX of the Constitution required procedural safeguards and a two-thirds majority for such issues. The Memorandum was debated anyway, leading to a boycott of the parliament by the Bosnian Serbs, and during the boycott the legislation was passed. The Serb political representatives proclaimed the Assembly of the Serb People of Bosnia and Herzegovina on 24 October 1991, declaring that the Serb people wished to remain in Yugoslavia. The Party of Democratic Action (SDA), led by Alija Izetbegović, was determined to pursue independence and was supported by Europe and the U.S. The SDS made it clear that if independence was declared, Serbs would secede as it was their right to exercise self-determination.