New Jersey Governor Chris Christie has said he is still looking into the possibility that other members of his staff were involved in the scandal over shutting down lanes onto the busy George Washington Bridge.
Christie said he will "take action" if it is needed.
More top news
Wet and windy for a time across many areas through this evening
The US president is losing another of his key aides in the latest of a string of high-profile departures.
TV veteran Sir Bruce Forsyth has died at the age of 89