"She's so sure of U.S. victimhood, so indignant that her eyes practically spit fire, yet Newport box 100s cigarettes, Cheap Newport 100s cigarettes in carefully analysing her words, it's all emotion and accusation, supported with little substance," Liu said of Regan on CGTN.
Liu accused Regan of being "emotional" and misidentifying facts after Fox Business said in a May 14 report Online Cigarettes Store USA and Buy Cigarettes Online that China steals $600 billion in U.S. intellectual property annually.
"They're launching a full-scale information war against the United States of America, and their latest target is me," Regan said on air and on Twitter this week.
On China's heavily censored internet, which blocks major Western news outlets, state broadcaster CCTV and the People's Daily newspaper have shared news of the debate on Weibo.
Other Chinese media outlets have joined in, some even circulating footage of Liu in an English speech competition from 23 years ago.
"When it comes to debating, Liu Xin won't feel any pressure," said one Weibo user.
But it was unlikely that ordinary folk in China would be able to see it in real time as Fox Business is not available to most viewers. Liu said on Twitter that because of rights issues, CGTN would not be able to show it live, though it would "report on it closely".