The twin brother of Poland's former president, who was killed in a plane crash in Russia, says he will run to be elected in his place.
Jaroslaw Kaczynski said he would stand in the presidential election on 20 June despite his "personal pain", in order to continue his brother's mission, the BBC reports.
Lech Kaczynski was killed in a plane crash in western Russia on 10 April, along with his wife Maria and 94 senior officials.
The brothers founded the Law and Justice Party in 2001.
Jaroslaw Kaczynski, 60, became prime minister in 2006, heading a right-wing coalition that had tense relations with the European Union and Russia.
He lost power in a general election in 2007. Lech Kaczynski had been expected to run for re-election in October - although polls suggested he would lose.
Parliamentary Speaker Bronislaw Komorowski, who became acting head of state after the crash, had been preparing to run against Lech Kaczynski.
Opinion polls have suggested that Mr Komorowski will defeat Mr Kaczynski in the snap election.