China accused the U.S. violating the trade deal that the world's two largest economies signed last month and vowed to take "resolute and forceful measures," per a briefing on Monday morning local time.

Donald Trump has said he will visit China after speaking to its leader Xi Jinping over the phone. The US president said he had reciprocated with an invite to the White House during the "very good talk" - though such a trip has not been confirmed by either side.