Johnson's spokeswoman Melinda Whitemarsh Schnell says the Republican will pay legal fees when bills are submitted. The lawsuit Johnson filed in January has proved divisive even among fellow Republicans and others in Washington.
Schnell responded Tuesday to accusations by a liberal watchdog group that Johnson didn't file everything required by campaign finance laws.
One Wisconsin Now executive director Scot Ross says Johnson should report details of an agreement with his attorney from the nonprofit Wisconsin Institute for Law & Liberty. Ross says he plans to file a complaint with the Federal Election Commission.