New Delhi, May 27 -- Hungarian Prime Minister Peter Magyar told lawmakers on Tuesday his party's majority in Parliament will form investigative committees to look into alleged corruption and abuses of power by Viktor Orban and his previous government.

Magyar and his center-right Tisza party defeated the autocratic leader in a landslide election last month. The win, which gave Tisza a two-thirds majority, allows it to roll back many of the policies that gave Orban a reputation among his critics as a far-right authoritarian.

Among Tisza's biggest campaign promises was holding Orban, his nationalist-populist Fidesz party and their allied business elites accountable for alleged misconduct.

Magyar said Tuesday six parliamentary investigativ...