We may also soon hear from the woman he fired. Christie says she lied about being involved.
The latest problem for Governor Christie - convincing Washington that extra money spent to feature him and his family during his re-election campaign wasn't political.
The ad that aired after Superstorm Sandy cost two million dollars more than ads without Governor Chris Christie.
Now federal auditors are looking into whether it was designed to boost tourism or Christie's re-election campaign. "It was at the expense of money from the taxpayers that could've been used for other Sandy purposes," said Rep. Frank Pallone (D) New Jersey.
This... As the bridge traffic scandal widens.
State lawmakers are creating a super-committee to investigate whether the governor's office created this four-day traffic jam as political payback for a democrat who did not support Christie. "There was apparently a very massive abuse of power, and an attempt to conceal that abuse of power." NJ State Assembly Deputy Speaker John Wisniewski
Subpoenas are expected as soon as Thursday for former campaign manager Bill Stepien
And Bridget Anne Kelly - the Deputy Chief of Staff Christie fired - their emails are linked to the bridge backup, but there's been no direct link to Governor Christie.
Supporters suggest it's a witch hunt. "Of course backlash is going to be substantial," said NJ Assembly Republican Leader, Jon Bramnick.
A new Monmouth University - Asbury Park Press poll taken after Christie's news conference shows 59 percent of new jersey residents still think he's doing a good job.
But his favorability in that poll is down 26 points since last year - raising questions about how Christie will weather this storm.
Tracie Potts, NBC News.
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