Wis. Stat. § 11.1301: Defense fund authorized.

(1) Any candidate or public official who is being investigated for, charged with, or convicted of a criminal violation of this chapter or ch. 12, or whose agent is so investigated, charged, or convicted, may establish a defense fund for disbursements supporting or defending the candidate, official, or agent, or any dependent of the candidate, official, or agent, while that person is being investigated for, or while the person is charged with or convicted of a criminal violation of this chapter or ch. 12.

(2) No person may use a contribution received from a contributor to a candidate committee fund for a purpose for which a defense fund is authorized under sub. (1) unless the person obtains the contributor’s authorization. Notwithstanding s. 11.1202 (3), any contributor may authorize the transfer of all or part of a contribution from a campaign fund to a defense fund.