Did you make a truce with the NCR yet? Or did you swap McNamara (the only level headed being in that bunker) for Paladin Hardass?
Oh wow, i didn't realise the ceasefire affects me aswell. Thanks for that!
Still, it's fairly late game stuff, with it being the last thing you can do before the point of no return, and even then only if you're with the NCR and McNamara.
EDIT: Knight Torres still turned on me