A veteran state lawmaker and practicing attorney whose firm has been subpoenaed by the Moreland Commission said it is vital for the Legislature to challenge the panel’s authority to force lawyers to divulge the names of their clients.

Senator John DeFrancisco, a Republican from Syracuse who is of counsel to DeFrancisco & Falgiatano, confirmed that his firm is among those that have received a subpoena demanding the identity of his clients and other information.