The U.S. Attorney's Office is opening a preliminary inquiry into the scandal surrounding New Jersey Gov. Chris Christie's administration.

In a press conference today Christie apologized, but maintained he had no knowledge of the actions of one of his top aides.

Emails showed Bridget Anne Kelly worked with a Port Authority official to shut down the two bridge lanes, causing massive gridlock in Fort Lee, New Jersey. The motivation was apparently a political vendetta over Fort Lee Mayor Mark Sokolich's refusal to endorse Christie for re-election.

Christie announced that Kelly, his deputy chief of staff, has been fired.

Judge Andrew Napolitano, a former Superior Court judge in New Jersey, joined Shepard Smith Reporting this afternoon to provide his legal expertise on what it means that the feds are now getting involved.

He also analyzed what civil liability the state could face. According to reports, EMS teams took longer than usual to reach a 91-year-old woman who had gone into cardiac arrest. She later died at the hospital.