An online stunt by a student activist poking fun at the administration for calling a snap election has drawn sharp criticism from the prime minister.

Yamato Aoki, 20, set up a website purporting to be run by a 10-year-old boy, which he used to ask faux-naive questions about the government's actions and performance.

Prime Minister Shinzo Abe weighed in on the stunt Tuesday, saying in a Facebook post that Aoki's feigning of childlike innocence was "despicable."