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Wildstein resigned last month amid the growing controversy. His attorney filed a motion on Wednesday asking a judge to squash a subpoena compelling Wildstein to testify.
He repeatedly cited his right to plead the Fifth Amendment when asked questions by John Wisniewski, the chair of the Assembly Transportation Committee holding the hearing.
Messages from Wildstein were among those included in newly released documents on Wednesday as part of state lawmakers' investigation into the closure of lanes onto the George Washington Bridge in Fort Lee, N.J., last year. Christie's opponents have accused his administration of closing the lanes out of political retribution.