Andrzej Duda, who was elected head of state in 2015, is slated to address a convention of Poland’s governing conservative Law and Justice (PiS) party, of which he is an ally, public broadcaster Polish Radio’s IAR news agency has reported.
Prime Minister Mateusz Morawiecki and Poland’s conservative leader Jarosław Kaczyński are also expected to speak at the high-profile event in Warsaw on Saturday.
Duda last week officially announced he would be seeking re-election in a vote this spring.
"Of course, I will run in the presidential election," he said at a public meeting last Wednesday, marking the first time he declared that he was officially in the race.
Earlier that day, Poland’s lower-house Speaker, Elżbieta Witek, announced that the presidential elections would take place on May 10, with a potential second round scheduled for May 24.
Duda is Poland's most trusted politician, according to the latest monthly survey by pollster CBOS, and the favourite to win May's election, according to a study carried out at the end of January by pollster Kantar for private broadcaster TVN.
His contenders in the presidential race include centrist Małgorzata Kidawa-Błońska; middle-of-the-road politician Władysław Kosiniak-Kamysz, leader of the rural-based Polish People’s Party (PSL); leftist Robert Biedroń; far-right hopeful Krzysztof Bosak; and celebrity journalist Szymon Hołownia.