The escalating rhetoric between President Trump and Mexico has raised concerns among commodity groups that trade between the two countries could be affected. For agriculture, the risk could be substantial as the U.S. sells billions of dollars worth of crops, dairy and meat across the border every year.

It is too early to say if the dispute will result in a trade war or loss in business, but concerns were already heightened with Trump’s moves to renegotiate the North American Free Trade Agreement. Ag groups early this week sent a letter to President Trump outlining the importance of NAFTA on food and agriculture trade.

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“Although some important gaps in U.S. export access still remain, increased market access under NAFTA has been a windfall for U.S. farmers, ranchers and food processors. U.S. food and agriculture exports to both countries have more than quadrupled, growing from $8.9 billion in 1993 to $38.6 billion in 2015,” the letter said.

In the latest verbal salvo, the Trump Administration this week threatened a 20% tax on imported Mexican goods to pay for the wall. That could drive prices higher for U.S. consumers for such things as fresh fruit and vegetables and even beer. However, by late week, White House Press Secretary Sean Spicer appeared to back away from that plan saying a tax “was one possibility for raising revenue for the border wall.”

“Mexico is obviously a huge customer. We are a huge buyer of their produce as well. It’s impossible to even begin to estimate impacts because there’s nothing to base guesses from other than Twitter,” said Bryce Knorr, Farm Futures senior grain analyst. “I imagine nothing will happen on food. U.S. consumers don’t want to pay more for tomatoes, and U.S. farmers wouldn’t want to see their corn not being sold.”

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U.S.-Mexico Agriculture 2015 Trade Data from the U.S. Trade Representative’ s office: