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Historically Presidents do net testify under oath. This is not a Bush "problem" - this is taken from the NY Times:

Over the years, the rule of thumb for presidential testimony is that the president is placed under oath when he testifies in a criminal proceeding or a lawsuit, as was the case, for instance, when Bill Clinton gave testimony to Kenneth W. Starr, the Whitewater independent counsel, and in a deposition in the Paula Jones lawsuit.

But presidents have generally not taken an oath when they were testifying before a fact-finding body. No oath was given, for instance, when Ronald Reagan answered questions from members of the commission investigating the Iran-contra affair or when Gerald R. Ford testified before a House subcommittee about his pardon of Richard M. Nixon.

Hope that helps you out!

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