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STORY: Opinion polls suggest the nationalist Law and Justice (PiS) government could win the vote but may struggle to form a majority amid discontent among some over rising living costs and concern over an erosion of democratic checks and balances.

The opposition is hoping Sunday's march becomes the biggest in decades and galvanizes voters to participate in the election.

PO leader Donald Tusk, a former European Council president, has said PiS could aim to take Poland out of the EU, something the party denies, and has framed the election as crucial for minority and women's rights.

PiS, in power since 2015, has campaigned on a pledge to keep migrants out of Poland, saying that was key for national security, and to continue funneling money towards families and the elderly.