It depends on what the meaning of sovereignty is
Bush spoke to journalists of color at the recent Unity Conference. Unfortunately for him. Here's his hilarious response to a question on the meaning of U.S. and tribal sovereignty with regard to the war on terror.
"Tribal sovereignty means that it's sovereign," Bush replied. "You're a -- you've been given sovereignty and you're viewed as a sovereign entity. And therefore the relationship between the federal government and tribes is one between sovereign entities." - link
But it's even better if you listen to this audio clip posted at Majority Report Weblog , so you can hear the panic in his voice. And the laughter from the audience.