In response to a recent uptick in migrant apprehensions at the U.S.-Mexico border, President Donald Trump threatened to close the port of entry in his latest crackdown on immigration. On March 30, Trump tweeted that the next step is to close the border should Mexico fail to stop migrants from entering the U.S.

On April 1, former Homeland Security Secretary Kirstjen Nielson authorized U.S. Customs and Border Protection (CBP) to re-deploy officers at the southern border to assist with managing the recent mass arrival of Central American immigrants. According to American Shipper, CBP plans to dedicate up to 750 officers from its Office of Field Operations to provide emergency immigration assistance along the southern border. On April 7, Kirstjen Nielson offered her resignation to President Trump.

Trump’s proclamation comes after the president warned of cuts in millions of dollars of aid to three Central American nations – Guatemala, Honduras, and El Salvador – aiming to reduce migration into the U.S. Last month, Trump declared a national emergency, citing a “national-security crisis on our southern border.” This declaration effectively allows him to circumvent Congressional approval for funding for a more substantial border wall. These efforts appear to be a delivery of his campaign promise to create stronger borders in the U.S. However, stricter borders affect on more than just immigration.

With increased personnel sent to the southern border, commercial trucking lanes experienced a massive obstruction. In some cases, the reported wait times at the border were up to five hours, virtually stopping trade for some border businesses. The wait times, compounded with the current trucking shortage, is already beginning to strain many companies with U.S.-Mexico operations. In addition to delaying goods, companies must also contend with the excess fuel costs associated with idling in line, the risk of spoiled goods, and the truck drivers regulated hours of service. In response, a coalition of 18 freight, agriculture, and manufacturing associations penned a letter to the White House, warning of the disastrous effect of closing the border.

"Unfortunately, any disruption to the flow of commerce resulting from the full or partial closure of our border would have a cascading effect – harming U.S. consumers, threatening American jobs and investment, and curtailing the economic progress that the Administration has worked to reignite," said the letter.

Should Trump elect to completely close the border in the coming months, some industries may experience shutdowns within weeks of closure. The automobile and agriculture industry are reportedly the most at-risk. Some reports indicate that the U.S. supply of avocados would be exhausted within three weeks of border closure.

To stay informed about the ongoing situation at the U.S.-Mexico border, please visit Supply Chain Dive, the Atlantic, American Shipper, and CNBC for  updated coverage.