Charles Li, Chief Executive at the Hong Kong Exchanges and Clearing (HKEX) tells CNBC he sees the possibility for a U.S.-China trade deal but also lists the challenges in getting there. Subscribe to CNBC International TV: http://cnb.cx/2wAkfMv Subscribe to CNBC International: http://cnb.cx/2gft82z Like our Facebook page / cnbcinternational Follow us on Instagram / cnbcinternational Follow us on Twitter / cnbci