Trenton, New Jersey (CNN) – A New Jersey state legislative committee investigating the George Washington Bridge scandal has set a deadline of Friday for the law firm that conducted an internal probe of the matter to hand over all of its documents.
The firm hired by Gov. Chris Christie's administration - Gibson, Dunn & Crutcher –released a report in late March that cleared him of any wrongdoing.
So far, the firm has been cooperating in turning over documents, legislators said.
But if all the committee’s requests aren’t met by Friday, it will move forward with a subpoena.
"We want to give them an opportunity to comply but we do have a limit," said John Wisniewski, Democratic co-chair of the special legislative panel. "The deadline is at the end of this week."
The committee is investigating suggestions that top Christie appointees and allies orchestrated traffic tie-ups near the George Washington Bridge in Fort Lee last September.
The U.S. Attorney's office in Newark is also investigating the matter, which involved sudden closures of access lanes to the nation's busiest bridge over several days.
Prosecutors and state legislators are looking at whether the gridlock was politically motivated.
Wisniewksi said his committee and the U.S. Attorney’s office have been communicating, and the legislators are “not interfering with their investigation."
"The end product of what we seek to do is different from the end product of what the U.S. Attorney's office is seeking to do,” he said, adding the committee wants to look at a reform package while federal officials are looking at potential criminality.
A poll released Tuesday indicated Christie's declining ratings are starting to stabilize after a double-digit drop since the beginning of the year. But 49% of voters surveyed say they don't believe Christie is telling the truth when he says he was unaware of the traffic incident until after the fact.
“Christie appears to have stemmed the decline in his personal and job performance ratings, following their precipitous drop with Bridgegate, but he is not out of the woods yet,” said David Redlawsk, director of the Rutgers-Eagleton Poll.
Almost seven in 10 voters say they consider the developing investigations a serious matter.