Chinese policies aimed at developing a stronger semiconductor sector are among a laundry list of emerging challenges posed by Beijing that representatives of the U.S. tech industry are urging President Obama to address during Chinese President Xi Jinping's visit to Washington in September. In an Aug. 11 letter to Obama, 19 tech business groups warned that China has implemented a “new program to acquire or indigenize U.S. semiconductor technology.” They also highlight Beijing's new national security law, restrictions on cross-border...