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Trump: "Tariffs have put the U.S. in a very strong bargaining position."
Threatens other countries with tariffs if they don't "make fair deals with us."
The US is expected to levy tariffs on another $200 billion of Chinese imports as soon as Monday.
China has threatened to retaliate and pull out of negotiations if that happens.
US President Donald Trump escalated his trade war rhetoric on Monday, threatening unspecified countries with tariffs is they "will not make fair...