Here's the New Yorker article Seymour Hersh talked about at the Carmel Authors and Ideas Festival. In it he says Bush is looking for a new pretext to bomb Iran. His attempts to create fear about a widespread nuclear program in Iran didn't produce much support, so he's changing his message to argue bombing is needed to support American ground troops fighting in Iraq.
Of course, Bush's new press secretary Dana Perino belittled the piece. That's par for the course, according to Hersh. Bush completely ignores the media and barely pays attention to his own party, unless they are part of the neoconservative branch.