The election victory of Nawrocki, who was backed by the nationalist opposition party Law and Justice (PiS), dealt a blow to Prime Minister Donald Tusk’s hopes of cementing the pro-European Union course he has set for the bloc’s largest eastern member and left his government floundering in the polls.

Conservative Karol Nawrocki was inaugurated Wednesday as Poland 's new president, which could set the country on a more nationalist course.

Nationalist historian Karol Nawrocki, who was sworn in as Poland's new president on Wednesday, is a former amateur boxer with a particular interest in the criminal underworld.Nawrocki later wrote on social media that Batyr had sought his advice and "thanked me with an interesting book,