Aliases: Esty.

"It's Senator Halivan to you Scratch! You've got a lot of explaining to do, and I'll give you just one minute to do it before I personally throw your butt in jail" -- Senator Esterbrook Halivan.

Batman requested Azrael protect Senator Esterbrook Halivan due whose life was in danger.

He was important for Batman due he was just the only man in Congress who was fighting to get the money Gotham needs to be rebuilt. Halivan was a moderate republican. Hawkish, conservative on foreign policy and pussycat liberal at home.

He was a huge fan of Nicholas Scratch.