Bob Woodward laid it out in State of Denial:
George W. pulled Bandar aside.
"Bandar, I guess you're the best asshole who knows about the world. Explain to me one thing."
"Governor, what is it?"
"Why should I care about North Korea?"
Bandar said he didn't really know. It was one of the few countries that he did not work on for King Fahd.
"I get these briefings on all parts of the world," Bush said, "and everybody is talking to me about North Korea."
"I'll tell you what, Governor," Bandar said. "One reason should make you care about North Korea."
"All right, smart alek," Bush said, "tell me."
"The 38,000 American troops right on the border." ..."If nothing else counts, this counts. One shot across the border and you lose half these people immediately. You lose 15,000 Americans in a chemical or biological or even regular attack. The United State of America is at war instantly."
"Hmmm," Bush said. "I wish those assholes would put things just point-blank to me. I get half a book telling me about the history of North Korea."
"Now I tell you another answer to that. You don't want to care about North Korea anymore?" Bandar asked. The Saudis wanted America to focus on the Middle East and not get drawn into a conflict in East Asia.
"I didn't say that," Bush replied.
"But if you don't, you withdrawl those troops back. Then it becomes a local conflict. Then you have the whole time to decide, 'Should I get involved? Not involved?' Etc."
At that moment, Colin Powell approached.
"Colin," Bush said, "come here. Bandar and I were shooting the bull, just two fighter pilots shooting the bull." He didn't mention the topic.
"Mr. Governor," Bandar said, "General Powell is almost a fighter pilot. He can shoot the bull almost as good as us."