In 2013, he became a member of a team of constitutional experts of the President Ivo Josipović who were supposed to draw up a draft of amendment to the Croatian Constitution which would introduce a number of changes that Josipović proposed as a platform for his campaign for 2014–15 presidential election. In the next year, Podolnjak was a legal adviser of conservative NGO "In the Name of the Family" about the constitutional aspects of the referendum on the change of electoral system which was proposed by the NGO.