Here are some questions that might be very worthwhile to pose to Scott McClellan tomorrow morning.

The president has instructed members of the White House staff (everyone in the Executive Office of the President) to cooperate fully with the Plame investigation. Does that order to cooperate amount to a bar on White House employees taking the fifth with investigators?

Does the president find it acceptable for members of his staff to invoke their fifth amendment rights in a criminal investigation and still remain on the payroll?

Does the president know whether members of his staff have invoked their right against self-incrimination in the Plame investigation?