When Elvis met Nixon: Aides recall Oval Office meeting (with video)

Sitting at his desk inside 1600 Pennsylvania Avenue later that morning, Krogh got a call from fellow aide Dwight Chapin.

"And he says, 'Bud the King is here,'" recounts Krogh. "And I looked at the president's schedule and I said what king? There aren't any kings on our schedule. What are you talking about? And he says, 'No, not any two-bit king, the King of Rock, Elvis Presley. He's right here!' And I said, 'Dwight, come on! It's going to be a long day, four days before Christmas.'"

Still thinking it's a joke, Krogh is floored when Elvis walks into his office with Schilling and gets another surprise.

"That was one of the most lovely half hours I've had, talking to you all and hearing Elvis talk from the heart about his country and what it meant to him," Krogh told Schilling.