WASHINGTON/BEIJING, Sept 17 – U.S. President Donald Trump will welcome Chinese leader Xi Jinping next week for their second meeting this year, as the two leaders seek stability in a relationship under pressure over issues ranging from trade to Taiwan and Iran to global worries about artificial intelligence.Xi arrives for his first White House visit in a decade at the helm of an economy on track to post a $1 trillion trade surplus for a second straight year. Trump, mired in the Iran war and with low approval ratings, is looking for trade wins he can tout to Americans unhappy with…