JUNEAU (AP) — A new group is getting involved in Alaska’s U.S. Senate race, aimed at curbing spending by outside groups that don’t disclose their donors.

CounterPAC wants Democratic Sen. Mark Begich and Republican hopeful Dan Sullivan to disavow any “secret” money spent on their behalves.

If such groups continue spending money, the candidate who benefits would donate money to a charity his opponent chooses.

CounterPAC co-founder Jim Greer said it’s less stringent than a Sullivan proposal aimed at limiting radio and TV ads by special interests. While Sullivan is in a contested primary, he and Begich have been the targets of outside groups.

CounterPAC is billed as a nonpartisan group financially backed by technology entrepreneurs. Greer says the group is filing with the Federal Election Commission and will disclose its donors.