For countless Americans, a video that surfaced Monday showing a Chinese academic bragging about his country’s hidden influence over the United States government might have come as a shock. For Gordon Chang, it was simply a grim warning of what might lie ahead. Chang, a lawyer and conservative commentator who specializes in U.S.-China relations, was a guest Monday night on “Tucker Carlson Tonight” on Monday where the topic was the threat of China on a potential Biden presidency. Carlson led off with a video of a disturbing appearance broadcast on Chinese television in November by Professor Di Dongsheng, an associate dean at Remnin University in Beijing.