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In a surprise announcement, President Donald Trump escalated the trade war with China, saying Sunday that tariffs would rise from 10% to 25% on $200 billion in imports by Friday.

Trump said over Twitter that talks have been going too slowly, and that "for 10 months," China has been paying tariffs to the U.S. of 25% on $50 billion of high-tech imports and of 10% on $200 billion of other goods. 

Saying that the "payments are partially responsible for our great economic results," Trump added that the tariffs on $200 billion of Chinese imports will go up on Friday.

Trump also appeared to say that $325 billion of additional imports from "China remain untaxed, but will be shortly, at a rate of 25%."

"The Tariffs paid to the USA have had little impact on product cost, mostly borne by China. The Trade Deal with China continues, but too slowly, as they attempt to renegotiate. No!" Trump wrote.

The White House had been threatening since last year that it would increase the fees on $200 billion worth of Chinese imports from 10% to 25%, but in December Beijing and Washington appeared to come to a truce. Since, it appeared an agreement was likely, but the markets were still on edge at every bump in talks. Talks are reportedly expected to resume this week. 

Trump's complete post reads: "For 10 months, China has been paying Tariffs to the USA of 25% on 50 Billion Dollars of High Tech, and 10% on 200 Billion Dollars of other goods. These payments are partially responsible for our great economic results. The 10% will go up to 25% on Friday. 325 Billions Dollars.... ....of additional goods sent to us by China remain untaxed, but will be shortly, at a rate of 25%. The Tariffs paid to the USA have had little impact on product cost, mostly borne by China. The Trade Deal with China continues, but too slowly, as they attempt to renegotiate. No!"

This story has been updated.