1234 - 2/21/2017 17:16

To threaten an embargo on food could be interpreted as an act of war. In fact, I almost think you would need to declare war with Mexico before any commercial interest would do such a thing. You might be able to declare a quota if you could justify it by a shortage in the US but there isn't a shortage. The Russians declared an embargo against imported European foodstuffs but that punished it's own population.
In any event a corn embargo against Mexico would simply guarantee the importation of South American corn unless you were willing to blockade Mexican ports. By then it would be war.