November 22 Quotes
There was no way of reopening the investigation into the assassination without the public finding out that the CIA and FBI both had deliberately misled the Warren Commission and the House Investigating Committee in the original investigation. Nixon and other politicians who likely knew of the scandal did not want the confidence of the public eroded in this important agencies, and that was probably his motivation for the turn down rather than trying to cover up facets about the assassination itself.
This was the reason that the FBI withheld information from the Warren Commission investigating JFK’s assassination. J. Edgar Hoover, the FBI Director was concerned that some people might conclude that the FBI bore some of the responsibility for the assassination for losing track of him. The CIA also withheld information to the commission to cover some of their misdeeds.