'The Three Amigos' John McCain, Lindsey Graham, Joe Lieberman go hiking in Arizona

John McCain documented the outing on Twitter.

— -- The boys are back.

"The three amigos together again!" tweeted McCain, along with a photo of the casually-dressed, baseball cap-wearing group.

In another photo McCain tweeted, he and Lieberman are wading in the water. "Where's Lindsey?" McCain wrote, illustrating his sense of humor.

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