At the federal elections in 2000, as one of the leaders of the Democratic Opposition of Serbia (DOS) coalition, Mićunović was again elected a Member of Parliament in the Chamber of Citizens of the Federal Assembly. After the victory of the Democratic Opposition of Serbia in October 2000, he was elected President of the Chamber of Citizens of the Federal Assembly on November 3, 2000. When the State Union of Serbia and Montenegro was established, in March 2003, Dragoljub Mićunović was elected President of the Parliament of Serbia and Montenegro on March 3 that year. He held this position to March 3, 2004.