Let’s set the stage for the FBI’s role in JFK’s visit to Dallas on 11/22/63. This is a snip from “Assignment Oswald” by James Hosty, these are the very first few paragraphs in chapter one:
Monday, November 18, 1963
TIME: 8:15 A.M.
“Okay, let’s have some quiet and get started.”
Gordon Shanklin, the Special Agent in Charge (SAC) of the Dallas-Fort Worth FBI office, had called an impromptu meeting of the forty or so agents present in the squad room. I closed a file I was reviewing at my desk and gave my attention to Shanklin.
“As you probably all read over the weekend in the Dallas Morning News, President Kennedy and Vice President Johnson will be coming to Dallas this Friday,” Shanklin said. “Frankly, this is news to me, and I confess it ticks me off to learn it first in the press. I just called headquarters and was told the Morning News story was the first they knew of Kennedy’s visit to Dallas, too. It seems everyone was told except the FBI. I have to assume the FBI liaison with the White House isn’t what it used to be.
“At any rate, I called this meeting to remind you all of a few things. As you probably know, the Secret Service wants no help from the FBI in protecting the president or his party. Vince Drain here” — Shanklin nodded toward Drain, who was sitting across from me at another desk — “has already made contact with the Dallas Secret Service office, but was politely rebuffed. He was told in so many words they needed no help from us.
“Because of all this, we’re going to do everything by the book, which means if any of you know of any threats of any kind to the president or vice president, refer them to the Secret Service. I want you all to err on the side of caution. If you have any doubt about whether to report a piece of information to the Secret Service, go ahead and report it. Let’s be on the safe side.... Okay, that’s it. Let’s get back to work.”
I think it is interesting that the FBI wasn’t informed of the visit earlier. Also that Vincent Drain was told that the Secret Service needed no help from the FBI. Perhaps the rumors that JFK and JEH didn’t like each other very much have some merit.