Czech Prime Minister Petr Necas resigned on Monday over a bribery and spying scandal involving his top aide and alleged lover that has plunged the recession-hit EU state into a fresh political crisis. "Mr President, in line with the constitution... I resign," he told President Milos Zeman, who called for talks with political parties to discuss the government's future. Zeman asked the rightwing Necas, who has been in office for three years at the head of a shaky coalition government, to stay on as caretaker leader until a new administration is named.