Updated 3:05 p.m. ET, 2/18/2014
(CNN) – A former top political adviser to New Jersey Gov. Chris Christie again objected to complying with a subpoena from a state legislative committee that's investigating the George Washington Bridge scandal.
Bill Stepien's lawyer, Kevin Marino, wrote in a letter Tuesday to the committee's counsel that Stepien will not provide the requested documents, saying he can “think of no lawful way the committee can obtain” the material.
"His principled objections to the subpoena raise significant legal issues that are no less valid because they here arise in the context of a politically-charged investigation," Marino writes.
The co-chairs of the legislative committee, Assemblyman John Wisniewski and Senate Majority Leader Loretta Weinberg, released a statement Tuesday saying they've received the letter.
“We will review it and continue our efforts to enforce the subpoena served on William Stepien," they said.
The committee issued the second round of subpoenas last week, after Stepien, along with another ex-Christie aide, Bridget Anne Kelley, refused to comply with the first round.
Stepien was a close adviser of Christie's and managed both of his gubernatorial campaigns.
Stepien's name surfaced in emails last month suggesting top Christie appointees orchestrated traffic gridlock around the bridge in Fort Lee to punish that town’s mayor politically for not endorsing the governor for reelection.
Christie said in a subsequent news conference that he had fired Kelly, while Stepien "was asked to leave my organization."
Christie said he also withdrew his support for Stepien to take over the New Jersey Republican Party, and Stepien's consulting contract with the Christie-helmed Republican Governors Association was terminated.
In addition to the state legislature, the U.S. Attorney’s Office is conducting a probe of the bridge scandal.
Christie has said he knew nothing of the traffic mess until after it occurred and only when media began reporting on it. He also has denied any knowledge of potential political mischief by advisers.
CNN’s Chris Frates and Peter Hamby contributed to this report.