Elvis Week: Elvis Goes to the White House 12/21/1970
I knew of this famous meeting and I found an excellent recounting of the visit by Egil 'Bud' Krogh who was a White House Deputy for Domestic Affairs in the early '70's, on Elvis Austrailia. The US National Archive even has special website dedicated to the meeting (can you believe it??) http://www.archives.gov/exhibits/nixon-met-elvis/main.php. The purpose of the visit was very specific, it went beyond a tour and photo op. Elvis seriously wanted to be made a special agent at large serving the Federal government. He wanted to share some of his own research on Communists and drug addiction. He came away from this visit with Bureau of Narcotics and Dangerous Drugs badge that he carried with him all the time. Elvis had an extensive collection of badges and firearms. It's also believed the FBI gave him a permit to carry a weapon in all the 50 states. As a gift to the President, Elvis gave him the firearm below.
One of the awesome parts of this story is that Elvis was allowed to walk into the Oval Office, with two firearms. One pistol he used for protection and this piece that was a gift. Unreal. No way that would happen today. Not a chance.