Washington (CNN) President Donald Trump suggested Tuesday that his 90-day deadline for completing trade talks with his Chinese counterpart Xi Jinping could be extended -- while also threatening to ratchet up tariffs if he isn't happy.

"The negotiations with China have already started," Trump said in a series of tweets on trade talks between the two countries. "Unless extended, they will end 90 days from the date of our wonderful and very warm dinner with President Xi in Argentina."

He then referred to his plan for escalating 10% duties on Chinese imports to 25%, tweeting: "Remember I am a Tariff Man."

The leaders of the world's largest trading partners struck a temporary truce on Saturday at a dinner in Buenos Aires, with Trump agreeing to maintain the 10% tariffs on $200 billion worth of Chinese goods, and to defer his original January 1 deadline for raising them further.

In exchange, China agreed it would be willing to purchase a "very substantial" amount of agriculture, energy and other goods from the United States to help reduce the trade imbalance.

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