President Xi Jinping on Sunday kicked-off the 20th congress of China's ruling Communist Party with warnings that he may use force to retake Taiwan as he slammed foreign interference in its reunification efforts. The gathering of roughly 2,300 delegates from around the country began in the vast Great Hall of the People on the west side of Tiananmen Square amid tight security and under blue skies after several smoggy days in the Chinese capital. Xi began a speech that touted the party's safeguarding of national security, maintaining social stability, protecting people's lives and taking control of the situation in Hong...