New Jersey Gov. Chris Christie is holding a news conference on Thursday to address revelations that a senior aide and two top political appointees forced days of traffic jams as apparent political retribution against the Democratic mayor of Fort Lee, N.J.

The scandal is casting a cloud over the 2016 White House hopeful’s effort to cast himself as presidential and above the political fray.

After the news conference, leaders of the Democratic-controlled Senate and Assembly are holding a legislative hearing on the scandal.

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