From Woodward:

"You always told me the truth," Barbara Bush opened, drawing Boren aside for a private chat. [David L. Boren was the former Democratic senator from Oklahoma who had been the chairman of the Select Committee on Intelligence during the presidency of George H. W. Bush.]

"Yes, ma’am," Boren replied.

"Will you tell me the truth now?"

"Certainly."

"Are we right to be worried about this Iraq thing?"

"Yes. I’m very worried."

"Do you think it’s a mistake?"

"Yes, ma’am," Boren replied. "I think – it’s a huge mistake if we go in right now, this way."

"Well, his father is certainly worried and is losing sleep over it. He’s up at night worried."

"Why doesn’t he talk to him?"

"He doesn’t think he should unless he’s asked," Barbara Bush said.

Eventually, my guess is: he was asked. Or Barbara picked up the phone herself.