New Delhi, April 14 -- Hungary's election winner, Peter Magyar, called Monday on the country's president to convene the parliament to form a new government "as quickly as possible," in hopes that he can take over from Viktor Orban as prime minister as early as May 5.

With an overwhelming new mandate, Magyar pledged to cooperate with other European countries, ending Orban-era obstruction of Europe-wide policies, while also representing Hungarians' wishes.

At a news conference Monday in Budapest, he promised to restore rule of law and overhaul government structures to make them more independent and able to fight corruption, and to create new ministries to address acute problems in areas like public health, environmental protection and edu...