From the wire service news resources of LexisNexis:

Mexican retaliation could hurt corn farmers; Shift to buyers in Brazil, Argentina may be a response to border tax

12:00 AM - Mexico is upping the ante in its escalating war of words with President Trump over trade policy by aiming squarely at the nation's midsection: the corn belt. And that's making U.S. corn farmers nervous. In response to Trump's threats of a border tax, Mexican Senator Armando Rios Piter said last week he plans to introduce a bill requiring the country to stop buying corn from the U.S. and shift those purchases to Brazil and Argentina.