The reason Bush doesn't want Gonzales under oath?

Because he's an outright liar, just like the President of these United States.

WASHINGTON Mar 24, 2007 (AP)— Last week, Attorney General Alberto Gonzales said he was not involved in any discussions about the impending dismissals of U.S. attorneys.

On Friday night, however, the Justice Department revealed Gonzales' participation in a Nov. 27 meeting where such plans were discussed.

If he wasnt involved it would have meant he wasn't really running his department. Now we know he was running him department and that he's a liar. Of course, we already knew he was a liar. This is one more lie and a very important one for the integrity of US justice. It's clear that the concept of 'justice' finds no room in Gonzales' soul.
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Link: Documents Show Gonzales Approved Firings by LARA JAKES JORDAN