"Prime Minister Beata Szydło submitted her resignation to the political committee of the party. The political committee proposed deputy prime minister Mateusz Morawiecki as a candidate to become the prime minister," said PiS spokeswoman Beata Mazurek.

"Thank you very much for all the words of support. Last two years were an extraordinary time for me and the service to Poland and Poles was an honour," wrote Beata Szydło later on Twitter.