After President Lech Kaczyński's death in a plane crash on 10 April 2010, the Constitution required the Marshal of the Sejm to declare the date within two weeks, with the election to take place on a weekend within the following 60 days, i.e. 20 June at the latest. On 21 April, the Marshal, Bronisław Komorowski, announced the election date as 20 June 2010. Candidates were required to register by 26 April 2010 (with 1,000 signatures of voters in support) and submit 100,000 signatures by 6 May 2010.