Attorney General Martha Coakley is calling for a change in state campaign finance law that would require super PACs to disclose donors and spending at least twice a month.

Coakley, who is also a Democratic candidate for governor, said that under current state regulations super PACs aren't required to reveal their donors until a week before the September primary election.

Super PACs, also known as independent expenditure political action committees, operate independently of a candidate's official campaign committee.

Coakley said in a letter to Massachusetts lawmakers Monday that super PACs should meet the same reporting requirements currently imposed on ballot question committees, which file twice monthly.

The Office of Campaign and Political Finance has also recommended the PACs voluntarily disclose their donors at more frequent and regular intervals.