The premature termination of a presidential term – be it by impeachment, resignation or death of the incumbent – is generally a rare phenomenon so that the respective regulations belong the constitutional provisions that are applied least often in political practice. Nevertheless, in recent years a number of European republics had to activate these stipulations, often for the first time. This post compares the regulations on acting presidents in European republics and discusses the consequences for the separation of powers and potential for conflict.
The resignations of German Federal Presidents Horst Köhler in 2010 and Christian Wulff in 2012 presented the first instances in which speakers of the Bundesrat had to take over presidential duties. Similarly, the tragic death of Polish President Lech Kaczyński in 2010 was the first event in post-1989 Poland that required the Sejm Marshal (speaker of the lower house) to temporarily fulfil the role of president. In Romania, the two impeachment attempts against president Traian Basescu in 2007 and 2012 also meant that the speaker of the Senate acted as president while the population was consulted in referenda. On the other hand, when Slovak president Schuster needed to receive specialist treatment in an Austrian hospital in 2000, the speaker of parliament and Prime Minister fulfilled his duties in tandem.
The above examples show that European republics show a great variation in who becomes acting president. In fact, Bulgaria and Switzerland are the only European republics with a functioning vice-presidency (although due to the collegial nature of the Swiss executive its position/relevance differs significantly)  and In the remaining countries it is not always obvious who takes over presidential duties in the case of presidential impeachment, resignation or death. The default option is to temporarily devolve the function to a representative of parliament (in all but Bulgaria, Finland and Switzerland representatives of parliament are involved), yet even here differences exist that have consequences for the division of power.
In France, Germany, Italy and Romania the speaker of the second chamber of parliament. As – except for Italy – the government is not responsible to the second chamber this arrangement guarantees a mutual independence of acting president and other institutions. Even though Austria and Poland also have bicameral system, presidential duties here are performed by the speakers of the first chamber and thus by politicians that are more prominent in everyday politics and usually belong to the governing party. In Austria this is partly mitigated by the fact that the speaker and the two deputy speakers perform this role together, yet in Poland the stipulation proved to be controversial – not only because the generally more political role of the Polish Sejm Marshal but also because of the fact that acting president Komorowski was the government’s candidate in the presidential elections. In the Czech Republic, likewise a bicameral system, presidential duties are also fulfilled by the speaker of the first chamber, yet in cooperation with the Prime Minister.
Countries with unicameral systems cannot generally choose a more independent political candidate, yet as the examples of Iceland and Ireland show it is still possible to create less political alternative by pairing them (among others) with the Chairman of the Supreme Court in multi-member committees that jointly fulfil the position of acting president. Estonia shows another way of ensuring independence of the speaker of parliament as acting president in a unicameral system. The constitution foresees that speaker of parliament temporarily gives up their function to act as president and a new speaker is elected for that period to maintain a clear separation of powers. Last, only Finland and Malta place the role of acting president in the hands of the Prime Minister which is even more exceptional when considering the great differences between the two political systems.
The comparison above has shown that variations in who becomes acting president do not vary according to the mode of presidential election or presidential powers and their origin often predate the current political system. An example for this are the regulations in the Czech Republic and Slovakia which both based their regulations on constitutional drafts that still were still designed for the countries’ functioning within a federal Czechoslovakia. Once the break-up was agreed and quick adoption of new constitutions was needed, the presidency was merely added and the actors that previously represented the republic at federation level became the designated acting presidents (Slovakia only introduced a co-role for the speaker of parliament in 1998 as it turned out that the constitution did not transfer enough power to the Prime Minister as acting president to maintain a functioning state after parliament failed to elect a new president).
The question of who is in charge when the president is gone might appear relatively insignificant at first glance given the rarity of early terminations of presidential terms or long-term absence of presidents during their term. Nevertheless, the different stipulations strongly affect the degree to which the presidency can or is likely to still fulfil its function as check-and-balance on other institutions while it is vacant. While this becomes more relevant the longer there is a vacancy in the presidential office, it still changes the balance of power within a political system already in the short term and therefore merits attention. For instance, during the one month that Slovak president Rudolf Schuster spent in hospital in Austria in 2000, Prime Minister Dzurinda and National Council speaker used their position as acting presidents to veto three bills to which Schuster had previously declared his opposition. Only shortly afterwards, the government majority passed the bills again and thus made sure that Schuster could no longer veto the bills or request a review before the constitutional court.
 The Cypriot constitution also institutes a vice-presidency which is reserved for a Turkish Cypriot while the post of president is to be held by a Greek Cypriot. Initially a Turkish Cypriot vice-president served alongside a Greek Cypriot president, yet the vice-presidency has been vacant for about 50-40 years. The start date of the vacancy is difficult to establish – while Turkish Cypriots have not participated in government or parliament since the 1963 crisis, the title of vice-president appears to have been used by Turkish Cypriot leaders until the coup d’état in 1974.
 Estonian members of government are also required to give up their place in parliament upon appointment and another MP enters parliament in their place for the time of their appointment.