No, the GWB administration refused to allow him from being tried. The man is a murderer, he killed a woman who was holding a baby in her hands. There is no excuse for such a person being in the employment of the US government. Further, the government had to pay mega-bucks for what happened there and as far as I know, not one person has been fired, been punished or failed to be promoted on account of it.
That's not exactly the truth...
"Recently, murder charges against the prime shooter, Lon Horiuchi, were dropped by the new Boundary County Prosecuting Attorney (known as the District Attorney in many other places in America), Brett Benson. The charges had been pending for years, while the federal judicial system ruminated over whether Horiuchi could be prosecuted by the State of Idaho. Finally, earlier this year, the green light was given by a federal judge. Horiuchi, the federal sniper who boasted of being able to hit a dime at a hundred yards, would stand trial for shooting Randy Weaver's wife, Vicky, in the head as she stood behind a door with her baby in her arms. She fell where she stood, shot by Horiuchi from much less than his claimed "perfect accuracy" range."
If by GWB, you meant the Federal government, they gave clearance for the State to try Horiuchi, the State did not.