Poles set to vote in postponed presidential election

Incumbent Andrzej Duda expected to face run-off against liberal mayor of Warsaw

Poles will vote on Sunday in a postponed presidential election that will determine whether the ruling rightwing populist party continues to have full control over the country's political system.

Andrzej Duda, an ally of the ruling Law and Justice (PiS) party, is standing for re-election in a crowded field of candidates, with the closest challenger expected to be Rafa Trzaskowski, the liberal mayor of Warsaw.