FILE - In this Oct. 23, 1973 file photo, Elliot L. Richardson speaks during a news conference at the Justice Department in Washington. President Donald Trump‚Äôs surprise firing of FBI Director James Comey drew swift comparisons to the Nixon-era "Saturday night massacre.‚Äù Both cases involve a president getting rid of an official leading an investigation that could ensnare the White House, said Douglas Brinkley, a presidential historian at Rice University.(AP Photo, File)