The anti-graft agency recently announced the money, most of which was received ahead of March 2013 general elections, came from donations and not from state investment fund 1MDB.
The People's Justice Party said the money was 26 times above the amount that Najib's ruling National Front coalition was allowed to spend in the elections. The National Front, which has ruled since independence from Britain in 1957, won the elections but lost the popular vote for the first time to an opposition alliance that includes the People's Justice Party.
With evidence of corrupt transactions, she said the results of the 2013 general elections should be nullified and new polls should be called.
The party also named 1MDB, the Election Commission and Adnan Mansor, the secretary-general of Najib's ruling Malay party, in the lawsuit.
Government officials couldn't be immediately reached for comment.
1MDB, set up in 2009 by Najib who still chairs its advisory board, has debts of 42 billion ringgit (USD 10.4 billion) after its energy ventures abroad faltered. Critics have voiced concern about 1MDB's massive debt and lack of transparency.
