The Line item veto has been prohibited since back in the 1990’s (I think there is a law governing this). That is why Frist & Company attached the Gambling Bill to the Ports Bill, which will definitely be signed by Bush-League. There is no way that Congress or Bush would fail to pass and sign the Ports Bill. Dirty politics, yes; within legal bounds, yes.
Even if Line Item Veto potential existed, there is no way that Bush would go against his GOP brethren.