WARSAW (Reuters) -U.S. President Donald Trump at the last minute requested MAGA-allied Polish President Karol Nawrocki join the Ukraine teleconference with European leaders on Wednesday, according to centrist Polish Prime Minister Donald Tusk, Nawrocki's bitter political rival who had been expected to attend.

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

Polish President Karol Nawrocki took part in a teleconference on Ukraine with U.S. President Donald Trump and European leaders on Wednesday, his office said, a call his bitter political rival Prime Minister Donald Tusk had been expected to attend.

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.

US President Donald Trump has officially invited President Karol Nawrocki to the White House. This will be Nawrocki's second meeting with Trump, as the two previously met during the Polish presidential campaign in May.

WARSAW - Polish President Karol Nawrocki took part in a teleconference on Ukraine with U.S. President Donald Trump and European leaders on Wednesday, his office said, a call his bitter political rival Prime Minister Donald Tusk had been expected to attend.

Poland’s new president, Karol Nawrocki, unexpectedly joined a call of European leaders with Donald Trump on Wednesday instead of the country’s veteran prime minister in a sign of his emerging clout with the US administration.

U.S. President Donald Trump has invited new Polish President Karol Nawrocki to Washington at the beginning of September, the chief of Nawrocki's cabinet said on Saturday.