Well, as you said, the decision wasn't made by you. I'm guessing that you're TOLD by others what access should be given to which employees.
I think that to head off an ugly scene (which could be approaching rather quickly), you should mention this to his manager, so that she isn't blindsided when he comes storming to her about you being discriminatory.
Being an administrative assistant tends to be a rather reactive role... be proactive here and head off a possible problem.

winkiebear
Deskdemon Editorial Board Member