WARSAW, June 2 (Reuters) - Polish nationalist opposition

candidate Karol Nawrocki won the second round of the country's

presidential election with 50.89% of the votes, the electoral

commission said early on Monday on its website.

His rival, Rafal Trzaskowski, the liberal Warsaw mayor and

an ally of the government led by Donald Tusk, got 49.11%.

Nawrocki, 42, a eurosceptic historian and amateur boxer

who ran a national remembrance institute, campaigned on a

promise to ensure economic and social policies favour Poles over

other nationalities, including refugees from neighbouring

Ukraine.

While Poland's parliament holds most power, the

president can veto legislation, and the vote was being watched

closely in Ukraine as well as Russia, the United States and

across the European Union.

On social media platform X, current President Andrzej

Duda, also a conservative, thanked Poles for going to vote in

large numbers. Turnout was 71.31%, the electoral commission

said, a record for the second round of a presidential election.

"Thank you! For participating in the presidential

elections. For the turnout. For fulfilling your civic duty. For

taking responsibility for Poland. Congratulations to the winner!

Stay strong Poland!" Duda wrote.