Answer:
An unlimited amount
Step-by-step explanation:
According to the Municipal Securities Rulemaking Board, given that an ex-issuer official is no longer in office and has no power to drive municipal securities business to his or her former firm in order to get a large campaign contribution in return.
His former firm, in this case, which is Municipal Finance Professional can contribute whatever amount they so wish, to the "clean up" campaign to pay off campaign debt.