The cases were heard by the Supreme Court’s Chamber of Extraordinary Review and Public Affairs, a body whose legitimacy is contested by Poland’s ruling coalition due to concerns over how its judges were appointed.
The panel examined three complaints, upholding two that cited irregularities in 12 local polling stations during the second round of the presidential election.
While the judges acknowledged procedural flaws, they ruled that the issues did not affect the overall result.
About 56,000 complaints were filed in total, though most are being handled behind closed doors.
During Friday's session, Deputy Prosecutor-General Jacek Bilewicz requested that the cases be transferred to a different chamber of the court, arguing that judges appointed after controversial reforms in 2017 should not rule on the validity of elections.
The chamber overseeing the review - called the Chamber of Extraordinary Review and Public Affairs - has drawn criticism for its composition and independence.
The Court of Justice of the European Union has ruled that the chamber "does not have the status of an independent and impartial tribunal."
One of the judges, Adam Redzik, described the matter as “fairly controversial” but said that electoral disputes fall outside the scope of EU law.
A final resolution on the election’s validity is scheduled for July 1.
Outside the courthouse in Warsaw, two groups of protesters gathered to voice competing views on the process.
Photo: PAP/Marcin Obara
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Source: IAR/TVN24/PAP