"He's a baseball fan," Gibson said. "It was an interesting conversation with him. He's very decorated, and I respect what he does in service of our country. It was interesting to get the time to share a few words with him. He's very passionate about what he does."
When practice was over, McCain walked through the D-backs' clubhouse and was greeted by several players, including Josh Collmenter, who came over to shake his hand and have a picture taken with him.
"I voted for him in Texas in 2008," Minor League pitcher Chase Anderson said, referring to the Senator's presidential run. "I'm a big John McCain fan. I mean, just what he's about. I really like his views on things. He's been a hero of mine, and my dad has liked him for a really long time. He's just a really good person all around. It brought chills to me, a little bit. It was a cool moment."
D-backs catcher Miguel Montero spoke privately with McCain about the unrest in his home country of Venezuela.
Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, and follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.