File- In this Saturday, June 8, 2019 file photo, Warsaw Mayor Rafal Trzaskowski, right, speaks with former Warsaw Mayor Marcin Swiecicki, as they walk in support of the gay pride parade in Warsaw. Trzaskowski, a pro-European Union liberal, has recently joined the race for the nation's president and has emerged as the main challenger to incumbent President Andrzej Duda who had previously seemed certain to win. The date of the vote is yet to be announced.