From John McCain's Faith of My Fathers, discussing his imprisonment by the North Vietnamese:
It's an awful thing, solitary. It crushes your spirit and weakens your resistance more effectively than any other form of mistreatment.... There is little doubt that solitary confinement causes some mental deterioration in even the most resilient of personalities.... Through flashed hand signals when we were moved about, tap codes on the wall, notes hidden in washroom drains, and holding out enamel drinking cups up to the wall with our shirts wrapped around them and speaking through them, we were able to communicate with one another.
The government's argument that Gitmo detainees imprisoned in isolation are not in solitary confinement, according to the New York Times:
The prosecutors argued that the way that Mr. Hamdan was being held did not constitute solitary confinement in part because "detainees can communicate through the walls."
So. Either John McCain, who's been campaigning on his mistreatment at the hands of the North Vietnamese for more than a quarter of a century, did not experience solitary confinement. Or the government's position is wrong. And he will condemn it, loudly and publicly.