The liberal Trzaskowski lost the July 12 runoff by a narrow margin to conservative incumbent President Andrzej Duda. Trzaskowski, who received 48.97% of votes, earlier conceded defeat to Duda, who received 51.03%.
Trzaskowski’s team and his Civic Platform party lodged a protest with the Supreme Court last week arguing that state-run media and the government were unfairly involved in boosting Duda's campaign, while not all Poles abroad were able to cast ballots.
Polish media reported Wednesday that Trzaskowski’s team and his party are also urging the top court to declare the election void. A spokesman for Trzaskowski's team, Jan Grabiec, confirmed it to The Associated Press.
Questions also have been raised about the legality of the election, whose first round was held on June 28 but was originally scheduled for May. It was pushed back at the last moment amid political wrangling over concerns for public health during the coronavirus pandemic.
The court, whose new president was recently appointed with the government's backing, has until Aug. 3 to rule on the protest and some 6,000 others lodged.