The UN is backing away from such measures so the neocons naturally want to ignore the UN (again). Russia opposes sanctions which would be dumb for two reasons, 1) Iran will retaliate by cutting off oil exports and 2) large amounts of trade could still flow in via the Caspian Sea and surrounding countries. But then, the neocons always have been long on bluster and short on brains.
Maybe the neocons want to insure their place in history
Nuremberg prosecutor: Bush and Saddam should both stand trial for war crimes
Condi, Rumsfeld, and Cheney too.