A former top Skadden, Arps, Slate, Meagher & Flom partner has been caught up in special counsel Robert Mueller’s ongoing investigation, as a referral sent to the U.S. Attorney’s Office for the Southern District of New York has resulted in an investigation into possible unregistered foreign lobbying work.

Greg Craig, along with former Minnesota Rep. Vin Weber and lobbyist Tony Podesta, are being looked at by Manhattan federal prosecutors, CNN reported late Tuesday. The referral, however, appears to have been made earlier than its public revelation, based on conversations with sources who requested not to be identified.