Nixon and the J.F.K. asination?

On the day of J.F.K.'s asination, the Secret Service agents that were "shielding" him from behind were ordered to back off and leave him vulnerable just before the shooting. The agent threw his hands up 3 times in protest but was told to back off away from the car even though there are handrails on the trunk that the agent uses to sit on and "shield" the president. Later, a reporter heard gunshots coming from a distance and ran towards some bushes. When he got there, he saw a agent come up from behind and was told to leave the area. This was a separate location outside of the Harvey's location. This agent that came out was the same person that was caught up in the Watergate scandal for breaking into the hotel room. He was Nixon's friend before and after the asination. Nixon was one of the most curropt polititions in history. Could he have had anything to do with J.F.K.? I saw this on the History channel and saw the footage of the agent throwing his hands in the air???