Ex-Christie aide denies knowing of bridge plot

A former aide to Gov. Chris Christie says she had no knowledge of or involvement in the political payback plot at the George Washington Bridge. 

The ex-aide, Christina Renna, is testifying under oath before lawmakers investigating politically motivated lane closings that caused gridlock in Fort Lee, the town at the base of the heavily traveled bridge between New Jersey and New York City. 

Renna worked under Christie's fired deputy chief of staff, Bridget Kelly. Kelly appeared to set the lane closings in motion with an email saying, "time for some traffic problems in Fort Lee." 

Renna, who resigned in February, is being questioned about the possible infiltration of politics in the governor's office during Christie's re-election campaign. She says Kelly communicated often with former Christie political operative Bill Stepien.