From the Center for American Progress:

President Bush had trouble holding his own at the talks. Reporters noticed that President Bush seemed out of his element during the trip. When reporters noted to National Security Adviser Stephen Hadley that Bush didn’t talk about his trade initiatives, Hadley remarked that “You didn't hear President Bush much talk about anything.” Perhaps that explains why President Bush left during the contentious negotiations, leaving an assistant secretary of state behind to sweat out the trade talks. They ended hours later in failure.

http://www.americanprogressaction.org/site/apps/nl/content2.asp?c=klLWJcP7H&b=699965&ct=1576323