I think that if it were important to the Senate, they’d pull together six or seven senators and a scribe or two and issue subpoenas, then hold a hearing.
McCain sounds tough but he built in an out.
After the election, this won’t be so much of an issue. Obama will deflect it if he wins, and Republicans never go after Democrats when they win.
And to those who claim he's not doing all he can to force the issue in the Senate... There is nothing the minority can force upon the majority - we can settle that next Tuesday!