A former Port Authority official and ally of New Jersey Governor Chris Christie is set to plead guilty over his role in the scandal surrounding lane closings on the George Washington Bridge. The official, David Wildstein, helped coordinate the closures with a top Christie aide when he worked at the Port Authority. Christie has denied having any knowledge, saying he only found out when the scandal broke open. But Wildstein has said “evidence exists” Christie was aware at the time, contrary to his public statements. It’s unclear which charges Wildstein will plead guilty to. He is expected to provide testimony at a hearing today.