His Excellency Rinchinnyam Amarjargal contributed to the democratic movement in Mongolia from the beginning of the democratization movement. He was a founding member of the Progress-Union and the National Progress-Party. Then he helped merge those with several other parties to form the National Democratic Party (MNDP, Mongolyin Undesnii Ardchilsan Nam). He was elected to State Great Khural (the Parliament) in 1996.

On July 30, 1999 he was finally designated as the Prime Minister of Mongolia. Also in the year 2000 the MNDP and the Social Democratic Party merged to form the Democratic Party. He stayed in office for almost a year until July 26, 2000, when the Democratic Party was defeated in the parliamentary elections. In 2001 Amarjargal established the Amarjargal Foundation. This is a NGO which promotes a transparent and open society, and carries out studies on social welfare, economy, politics, and law. It also negotiates foreign help and investment. In 2004 Amarjargal was elected to the parliament as an independent candidate.