Komorowski became acting president on 10 April 2010 following the death of President Lech Kaczyński . His first decision was to announce seven days of national mourning beginning on 10 April . According to the Constitution of Poland , Komorowski was required to set a date for the next presidential election within 14 days of assuming the position , the election date coming within 60 days of that announcement . On 21 April , his office announced that the election would be held on 20 June . In the election , he got 41.54 % of votes in the first round and then faced Jarosław Kaczyński , who got 36.46 % of votes in the first round
death of President Lech Kaczyński
2010 Polish Air Force Tu-154 crash
Bronisław Komorowski