Chinese leader Xi Jinping brought up the issue of Taiwan Thursday during President Trump’s visit to China, warning that the “Taiwan question is the most important issue in China-U.S. relations.” “’Taiwan independence’ and cross-Strait peace are as irreconcilable as fire and water,” Xi said. “Safeguarding peace and stability across the Taiwan Strait is the biggest common denominator between China and the U.S.” The move doesn’t bode well for the U.S.-China summit, which Trump had said could be “