TRENTON, N.J. — The former appointee of Gov. Chris Christie who directed lane closures that backed up traffic for hours in one New Jersey town is reiterating that he is ready to share more information if he can be granted immunity from prosecution.

Meanwhile, 17 other people and three organizations are being issued subpoenas as lawmakers try to learn exactly how the September lane closures on an approach to the George Washington Bridge from the community of Fort Lee happened and why.

David Wildstein, whom Christie appointed to a position in the Port Authority of New York and New Jersey, has already supplied a legislative committee with the most damning documents in the case so far, including an email from a Christie aide saying it was "time for some traffic problems in Fort Lee," a sign that the lane-closing plot was hatched by Christie's aides as a political vendetta.