Bill Thompson, New York City’s former comptroller and a two-time mayoral candidate, is embroiled in litigation with two law firms over whether he and his campaign treasurer are personally liable for legal fee debts from a 2009 political campaign.

While the issue is before a New York appeals court in one case, Thompson and his campaign treasurer, James Ross, are suing Stroock & Stroock & Lavan in another case to permanently stay arbitration the firm brought against them for $109,000 in unpaid fees.