A row has broken out over the decision to bury President Lech Kaczynski of Poland and his wife in Wawel Cathedral in Krakow - a place reserved for Polish kings and heroes.
Mr Kaczynski will be the first president to be buried there, close to Marshal Jozef Pilsudski (the founder of modern Poland).
Hundreds of people have taken to the streets in protest and thousands have joined an internet campaign to object.
Mr Kaczynski died in a plane crash in Russia on Saturday along with his wife and 94 other senior national figures.
The party was en route to attend a memorial for the Polish victims of a World War II massacre by Soviet secret police at Katyn.
The couple's funeral will be held on Sunday.
Elections for a new president will be held in June. Acting President Bronislaw Komorowski is expected to name the exact date after consulting political parties.