Hammer...*

Hagel Nomination, Jan 2013.

McCain backing the Bush administration and its neoconservative and Hagel was part of the growing movement of dissent. 

One of McCain's favorite parts of the Bush strategy was the surge, which sent 20,000 additional troops into Iraq [total 130,000].
McCain attempted to re-litigate whether the surge was the right decision, aggressively pressing Hagel on whether he stands by his past statements. He quoted Hagel as saying in 2007 that the surge was the "most dangerous foreign policy blunder in this country since Vietnam."

"Were you right?" McCain asked. "Were you correct in your assessment?"
"Well, I would defer to the judgment of history to sort that out," Hagel said.

Hagel added that his comment about the "most dangerous foreign policy blunder" was not just about the surge, but about the overall decision to invade Iraq -- 

A belief he stood by because it took the U.S. focus off Afghanistan.
Nothing much changed since Bush, 
Now is Iraq, Syria, Libya, and Yemen. 

If all you have is a hammer, everything you see looks like a nail.  Just a thought.