NO............
............ don't talk politics!! Presumably said minister is aware of your military connections/interests, unless you are being invited as 'husband of' and he doesn't know you from Adam (that's just Adam - not Adam Smith you understand).
If politics come up, I'd ask him how he is enjoying the challenges of office, etc but if he asks what you think of the Defence Review, have seven bullet points as to what's wrong with it and tell him how to log on to pprune where he can get the detail!!! My MP responded to a letter i sent him and all he could trot out was the party line and didn't seem to understand about 'capability gaps' , 'overstretch' or anything else.
You could always find out whether he had pay back any dosh and then ask him what he thinks of the new expenses regime - you won't get invited again of course!
O-D