U.S. President Donald Trump and Chinese leader Xi Jinping attend a welcoming ceremony in Beijing in November 2017 — Trump's last visit to the Chinese capital as U.S. president. | REUTERS U.S. President Donald Trump has revived lingering concerns that he could cut a deal with Chinese leader Xi Jinping that leaves Taipei in the lurch when he is feted with a lavish state visit to Beijing later this week. White House officials have sought to downplay these fears, but when it comes to the intricacies of the United States’ ties with China and Taiwan, Trump — infamous for his off-the-cuff style — will have his work cut out for him avoiding linguistic traps that could break with decades of U.S. policy toward the democratic island that Beijing claims as its own. For months in the run-up to the summit, concerns have grown that Trump, eager to clinch economic agreements with Xi, might let the Chinese leader have a say in U.S. weapons sales to Taiwan or agree to soften American declaratory language toward Taipei.…