Newark mayor Cory Booker (C) talks to the press as New York City Mayor Michael Bloomberg (4L, arms crossed), Boston mayor Thomas Menino (2R, yellow tie) and other members of the "Mayors Against Illegal Guns" coalition look on during a press presentation of a new television advertisement in Jersey City, USA, 18 April 2007. The campaign seeks the repeal of the ?Tiahrt Amendment? which restricts the access of cities and law enforcement to gun trace data.