NEWARK, N.J. (AP) -- The former aide to New Jersey Gov. Chris Christie who prosecutors say sent the "time for some traffic problems" email that started the George Washington Bridge lane-closing scandal is due back on the witness stand.
Federal prosecutors are expected to begin cross-examining Bridget Kelly on Monday morning. She was Christie's deputy chief of staff and is on trial along with a former Port Authority of New York and New Jersey executive whom prosecutors say launched the plot as revenge against a Democratic mayor who wouldn't endorse Christie.
Prosecutors say Kelly sent the email to David Wildstein, the self-described mastermind of the plot who has pleaded guilty and is the government's key witness.
Kelly testified Friday that the Republican governor approved of a traffic study on the bridge. But prosecutors claim the study actually was a cover story for a political payback scheme designed to cause traffic jams.
Christie has not been charged and denies any wrongdoing.
In a statement issued Friday, Christie spokesman Brian Murray said the governor had "no knowledge prior to or during these lane re-alignment" and "no role in authorizing them." Murray added that anything said to the contrary "is simply untrue."
The scandal developed just after Christie won re-election handily and as his national political profile was rising. It ultimately weighed down his presidential campaign, which ended with a fizzle in the primary season after a poor showing in New Hampshire.