I'm pretty sure you are off there.
In 1998 Gore symbolically signed the treaty, both Gore and Lieberman stated that the treaty would never be acted upon until developing nations began participation. Clinton never submitted the treaty to the Senate for ratification.
Bush continued the policy and also has not submitted the treaty to the Senate. The treaty was never ratified to be cancelled both of those Presidents cited the inequality of the Treaty. Where China, the second-largest emitter, is exempted. And Germany and India, also large contributors, of those India was also exempted from the treaty.
Bush never "cancelled" the treaty as it has never been submitted for ratification by the Senate.