Through all that time he remained one of the leading politicians on the left wing. In the early 1990s, together with Mieczysław Rakowski, he was suspected in the case of the so-called "Moscow loan". After revealing that affair in 1991, Włodzimierz Cimoszewicz called Miller to abstain from taking an MP's oath due to accusations laid against him. When Miller was cleared of the charges, Prime Minister Cimoszewicz appointed him later as the Minister in Charge of the Office of the Council of Ministers and in 1997 the Minister of Internal Affairs and Administration in his government. In turn, Cimoszewicz later became the Minister of Foreign Affairs in Miller’s cabinet.