President Bush and Japanese Prime Minister Yoshiro Mori are expected to discuss Japan's ongoing economic problems when they meet for a working lunch Monday, the White House said Friday. "I expect the leaders will discuss economic challenges and opportunities that we face," White House spokesman Scott McClellan told reporters during the regular press briefing. "It is in our interest that Japan be economically strong and prosperous," he said, ducking a question about whether the two leaders would specifically address the dollar-yen exchange rate.