May 06, 2019
He said on Twitter the US would more than double tariffs on $200bn (£152bn) of Chinese goods on Friday and would introduce fresh tariffs.
Recent comments had suggested both sides were nearing a trade deal.
A Chinese delegation is preparing to travel to Washington for negotiations aimed at ending the trade war.
It is not clear whether Beijing's top trade negotiator Vice-Premier Liu He will be part of those negotiations that are due to resume on Wednesday.