well if the cop is physically in your driveway, you can FORCE them to move. That is illegal for the cop to be there for no reason in the US.
Just tell him my driveway isn't state property, its private.
i came dangerously close to getting arrested over something like this. i had a job with an extremely inflexible attendance policy and i was in a rush (and tired and hungover) and there was a cop parked next to me in the driveway partially blocking the sidewalk and another slightly blocking me in from the street (if the cop wasn't IN my driveway so close to my car i could've gotten out diagonally). there were about 5 cruisers on the street. so i run up to the first cop i see standing there and ask if the guy blocking me in could move, but he was up in an apartment somewhere. so i ask who's car is in the driveway and instead of offering to move he just says, "that's me" and goes back to doing some computery shit on some hand held thing.
so then i got a little snippy with him and told him i'm in a rush, and he actually told me to "wait a minute" and he'll "try to find" the guy who's blocking me in from the street. i was in no mood so i screamed, "WHY THE FUCK CAN'T YOU JUST MOVE YOUR FUCKING CAR SO I CAN GO TO FUCKING WORK??" so he starts the whole "you better calm down" routine so i get in my car and start laying on the horn and screaming about how someone needs to move and if this was a better neighborhood they wouldn't pull this shit. i realize this sounds like an overreaction but the company's policy was no joke and the money was good. also i fucking hate cops.
suddenly all these cops have the time to come over to my car from out of nowhere and tell me how i'm gonna get arrested if i don't stfu. so i start taunting them and daring them to come onto private property to arrest me and telling them to move some fucking cars since they clearly have nothing better to do (at this point i was in full tantrum mode). they proceeded to come onto the property and explain that i'm making a disturbance and "being disorderly" and they can arrest me no matter whose property i'm on. by now there was an audience of people laughing and cheering and yelling at the cops to move. they were fucking chanting "MOVE YOUR CAR" which would have been glorious if i wasn't on the verge of a coronary event. the cops must've sensed that an actual incident was brewing (it's one of "those" streets) so someone moved the car in the street and i left. i was 2 minutes late but not late enough for a warning and i was in a foul mood for the rest of the day.
tl;dr fuck the police and their entitled cunt attitudes