Since winning power back from the hands of his populist rivals a year and a half ago, Poland’s Prime Minister Donald Tusk has faced one very stubborn roadblock to his plans: the country’s president.

Poland’s presidential election will determine whether the country can restore the rule of law and remain a reliable partner in the European Union after nearly a decade of divisive right-wing populist rule.

Poland will hold the first round of voting in its presidential election on Sunday. This is a hotly contested race between two main candidates – one from Civic Platform, the lead party in the ruling Civic Coalition, and the other an independent backed by the main opposition party, Law and Justice (PiS).