Mar 9, 11:58 AM (ET) By WASHINGTON (Reuters) - The White House said on Tuesday it was possible President Bush could be questioned longer than an hour he agreed to by a commission investigating the Sept. 11, 2001, attacks, an apparent concession that came after criticism from Democrat John Kerry. White House spokesman Scott McClellan, asked several times if Bush would stick to his insistence the session before the commission be restricted to one hour, said it was scheduled for an hour but that "the president of course is going to answer all the questions they want to raise." The...