Senator Jack Kerrigan was loyal to Percy, cause he made him Senator.
He had an affair with Anna Harcourt. He wanted Percy to clean up the mess. Senator made Anna pregnant, and didn't want anyone to know that. So he allowerd Division to kill Anna, and clean the mess he made. But for a trade, he had to cancel everything at the Council meeting of the Senator's. So Percy can keep Division out of sight.
Nikita held senator at gunpoint so that she can escape. She released him soon after.