NEW YORK (REUTERS) - A former New Jersey official on Friday claimed Governor Chris Christie knew about politically motivated traffic jams as they happened, re-igniting a political scandal that has taken a toll on the prominent Republican.
The letter from a former official at the agency that oversees the busiest U.S. bridge sparked a quick response from Mr Christie, who again denied wrongdoing, and prompted a top New Jersey newspaper to suggest the governor could face impeachment.
David Wildstein, who resigned his Port Authority post late last year, said in a letter that he had proof of the "inaccuracy" of some of Mr Christie's statements about the so-called "Bridgegate" scandal, which polls show has already started to weigh on Mr Christie's potential 2016 White House bid.
Since the scandal first came to light, Mr Christie has denied knowing the cause of the George Washington Bridge lane closings, which occurred after the mayor of Fort Lee declined to endorse the governor in a re-election bid and caused four days of massive traffic jams in that city.
"It's the first time a high-level official has contradicted the governor," said Julian Zelizer, a Princeton University history professor who specializes in presidential politics.
The letter does not indicate that Mr Christie orchestrated the closures in any way, does not specify exactly when he became aware of the jams, and offers no evidence to back up the claim.
"Mr. Wildstein contests the accuracy of various statements that the governor made about him and he can prove the inaccuracy of some," the letter said.
Mr Wildstein and Mr Christie attended Livingston High School at the same time, but Mr Christie, a former federal prosecutor, has denied knowing Mr Wildstein well.
One key question is exactly when and how Mr Christie learned of the closures, said Fort Lee Mayor Mark Sokolich, a Democrat.
"There aren't enough facts. I'm not rooting for him to know or not to know. I will tell you, I remain very, very concerned about it," Mr Sokolich told CNN. "If it was known at the very tail end, possibly, I'm not sure what this letter means at all."
Assemblyman John Wisniewski, who has led the investigation into the lane closures, told CNN late Friday that "these are serious allegations, because what Mr. Zegas's letter is saying is - you shouldn't believe the governor." "But we need to see the documents to see whether there's any merit to that claim, to not believe the governor."
The key question, Mr Zelizer said, is whether Mr Wildstein can produce "smoking gun" evidence proving Mr Christie's knowledge of the events. State Democrats probing the scandal are likely to jump on that vulnerability, Mr Zelizer added.
The Newark Star-Ledger, one of New Jersey's largest newspapers, which endorsed Christie in his 2013 re-election bid, posted an editorial after the New York Times first reported about the letter, saying that if the accusations are true, the governor must resign or be impeached.
"Because it will show that everything he said at his famous two-hour press conference was a lie," the editorial said.
The paper had not endorsed Mr Christie's initial run in 2009.