Although Chinese President Xi Jinping hinted that he may be willing to concede to some of President Donald Trump’s demands after what appeared to be a brewing trade war between the two countries, U.S. farmers remain on edge over worries of potential tariffs on American agricultural imports.

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While U.S. stocks surged on Tuesday following the news, not everyone is convinced that Beijing will truly reconsider some of its trade practices — like opening up the Chinese auto market to U.S. manufacturers and rescinding the existing 25% tariff on American vehicles — and warned that proposed tariffs could have an adverse effect on the economy.

“Let’s see if it’s sustainable,” CME Group Chairman and CEO Terry Duffy told FOX Business’ Neil Cavuto on Tuesday. “We’ve heard this type of comments coming out of China before, whether it’s on intellectual property or other products. But one of the things that I think here for the American producers of food is a very big deal. Because that is one of our number one export products that we have here.”

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