The FBI has moved to fire a veteran agent who alleged that the bureau had mishandled domestic investigations. On Thursday, Robert Wright was ordered by superiors at an FBI counterterrorism command office in Washington to hand over his badge and weapon, was suspended and was told he would be fired within 30 days, said an official with Judicial Watch, a government watchdog group whose attorneys represent Wright. Wright was told he was being dismissed for, among other things, publicly discussing sensitive FBI matters in 2003, the official said. Wright has been under disciplinary investigation for almost three years. He has two lawsuits pending against the FBI. Yesterday, Sens. Charles E. Grassley (R-Iowa) and Patrick J. Leahy (D-Vt.) sent FBI Director Robert S. Mueller III a letter repeating their support for Wright and expressing concern that the FBI was retaliating against him for his public statements.