Lawyers for the District of Columbia are fighting a request from a private attorney who wants more than $3.12 million in fees for successfully challenging the city’s handgun ban.

The attorney, Alan Gura, who argued and won D.C. v. Heller in the U.S. Supreme Court, said in court papers that prosecuting the case was “far more protracted and difficult” than anticipated. Gura, who recently won another landmark handgun case, is pushing for a fee enhancement.