Rau twice served as President of the Bundesrat in 1982/83 and 1994/95, and was deputy for the Federal President. In 1998 Rau stepped down from his positions as SPD Chairman and Minister President, and on 23 May 1999, was elected Federal President by the Federal Assembly of Germany to succeed Roman Herzog (CDU). On 1 July 2004, he was succeeded by Horst Köhler.