Prior to his tenure as a European Commissioner, Siim Kallas Siim Kallas is an Estonian politician, former Prime Minister of Estonia, and former European Commissioner. was the Prime Minister of Estonia, Estonian Minister of Finance, Estonian Minister of Foreign Affairs, a member of the Supreme Council of the Soviet Union, and a member of the Riigikogu The unicameral parliament of Estonia. . Siim Kallas Siim Kallas is an Estonian politician, former Prime Minister of Estonia, and former European Commissioner. is a member and former leader of the free-market liberal Estonian Reform Party and a former vice-president of Liberal International. After leaving the European Commission, he ran in the Estonian presidential election in 2016 but was not elected.