In the late 1970s and 1980s, he published several treatises in the field of constitutional law in the condition of Yugoslav self-management socialism.
[1][2] In the late 1980s, he emerged as one of the foremost members of the reformist leadership in the League of Communists of Slovenia, together with Milan Kučan.
He rose to prominence as the chairman of the Slovene delegation at the 14th Congress of the League of Communists of Yugoslavia, held in Belgrade in January 1990.
Although this coalition, led by the Liberal Democrat Janez Drnovšek, gradually disintegrated between 1994 and 1996, it prevented the political isolation of the former Communists and ensured their return to power.
[citation needed] He published the book Človekove pravice in ustavna demokracija [Human Rights and Constitutional Democracy] (Študentska založba, Ljubljana, 2010) in which he has tried to developed a doctrine of “positive activism” of the Constitutional Court, an activism which is in favour of higher standards of protection of human rights and freedoms.
In early 2012, the government of the Prime Minister Janez Janša opined that he was not a member of the Commission as, according to them, his appointment in January that year had been invalid.