This is a very interesting article which may provide some insight as to why McCain is trying so hard to create a false narrative about Benghazi.
Could he be attacking the President in hopes that it will act as a deflection from his miserable judgments of the Libya situation over the years? Is it some convoluted attempt to cover his own ass? Or, does the "scheduling conflict" suggest that he's simply losing it?
Whatever the answer may be, the idea that both he and Graham wanted to arm Libya just a few years ago is yet another troubling development in the saga of right wing Warhawk/Chickenhawk history.