He would never do anything bad?
Regardless of whether we trust this administration, giving Bush the power to arbitrarily declare anyone an "enemy combatant" will also bestow that power upon his successor.
Nightmare scenario: President Rodham-Clinton.
Scared, yet?
No, whether he has rights or not are being subjected to due process. Congress is involved and the federal courts have ordered the Gov't to answer to a writ of Habeus Corpus.