WARSAW — Poland formally asked the U.S. on Monday to arrest and extradite former Justice Minister Zbigniew Ziobro, seeking to prosecute the fugitive politician from the nationalist Law and Justice (PiS) party for alleged abuse of power, diversion of public funds to political allies and spying on opponents.

Prime Minister Donald Tusk’s pro-European government has pledged to hold PiS accountable for what it claims was corruption during the party’s rule from 2015 to 2023.

Ziobro, a highly controversial figure, pushed through sweeping judicial reforms that gave the government of the day broad influence over public prosecutors and disciplinary control over judges, putting Poland on a collision course with Brussels.