President Trump's plan to build a border wall between the United States and Mexico is a bad idea for many reasons, from insulting a close trading partner to harming migrating wildlife to the fact that the wall won't actually improve current border defenses.

According to a 2009 study conducted by the Migration Policy Institute, a nonprofit independent think tank, 97 percent of undocumented migrants are still able to make it into the United States, even with walls constructed at various points along the border. "There is no barrier known to man that will stop someone who has traveled hundreds of miles to feed his family," a border patrol agent told the Daily Beast. "He will go over, under, or around anything you put up."

But let's say Trump's wall does get built and it succeeds in preventing illegal immigration along the Mexican border. And say he also goes through with his plan to deport millions of undocumented immigrants already in the U.S. One of the biggest impacts will be seen on America's farms, and consequently, Americans' dinner tables. According to the U.S. Department of Labor’s National Agricultural Workers Survey, between 50 and 70 percent of farmworkers in the the nation are undocumented. Based on these estimates, between 1.2 million to 1.75 million farmworkers are undocumented. These workers pick the vast majority of produce grown in the United States.

What's more, legal residents and citizens don't want these jobs. A 2014 report commissioned by the nonprofit American Farm Bureau Federation found that U.S. citizens and legal residents are simply not interested in the farmworker positions that are ultimately filled by undocumented migrants.