Dick (1999)

The year is 1972, and like most high-school students Betsy Jobs (Kirsten Dunst) and her friend Arlene Lorenzo (Michelle Williams) just want to have a good time. But when, during a class field trip to the White House, they cluelessly wander into a behind-closed-doors, top-secret shredding session, it's time to both wag the dog, and walk it.
Seeking to uncover just how much the witless duo has discovered, the Commander-In-Chief, appoints them "Official White House Dog Walkers", and it isn't long before the girls go from taking Checkers, the dog, out for walks, to taking out Tricky Dick, himself.