There's no statement the President could make--and nothing to be gained if he made it--that would not be twisted by the press into something else.
The best course of action is for Bush to let the US and the world see him as a Pressident focused on the war on terrorism, homeland security, improving the US economy, fixing Social Security, nominating the next SC justice(s)....and making a recess apointment of Bolton to the UN post.
The problem is that if Bush DOES defend Rove, the Bushbots will flop over and claim it is a stroke of genius. He's a genius for remaining slient. He's a genius for speaking out.
But I'm an idiot. Oh well....