USA automakers stand to be among the most affected if the link to Mexico is shut.
"We haven't seen a time in the United States when supermarket shelves are bare from fresh produce in a long time", president of the Fresh Produce Association of the Americas Lance Jungmeyer tells CNN.
"They say they're going to stop them".
Despite all this, it is also worth noting that the Mexican government in a bid to appease Donald Trump began a program that will allow migrants work in the US while they are waiting for their case to be handled.
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"We do need to send a message to Mexico, this is an emergency, but I think you can stop pedestrian flows while not stopping railroad, trucking, and other things that are keeping our economy alive", he said. The president last threatened to shut down the border during the heat of the midterm elections and threatened the same action last spring, though he didn't follow through in either instance.
For their part, the USA congress people highlighted coincidences with Mexico's stance regarding the development of the south and Central America, as well as its impact on migration, and expressed their will to maintain frank and open dialogue with Mexico from the Congress of the United States. "I see the whole industry shutdown within a week of a border closing".
He says some don't realize the value of the close relationship between the USA and Mexico, especially at the border, and that the border should only close in extreme cases like a declaration of war. So it's an argument that should be made to the US public, in addition to, but not instead of, a conversation on migration, he said.
On Monday, Mexican Interior Secretary Olga Sanchez Cordero said the Mexican government does not plan to adopt a special plan to restrain caravans of migrants from Central America that travel through the country to the United States. Some vehicles like the Chevrolet Blazer SUV are only made in Mexico.
"If the President is going to make these kinds of threats, it would be great to be more specific about it, so we can tell American citizens what to expect", said Schwab. "We ended the day yesterday at Otay Mesa [California] with a backup of 150 trucks that hadn't been processed", the official said.
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A shutdown such as that would impact millions of legal border crossings, as well as trades amounting to billions of dollars - the food imports alone are reportedly worth an eye-watering $137 billion (£104bn).
The U.S. Customs and Border Protection estimated that some 100,000 migrants would be apprehended or encountered at the border in March, the highest level in a decade.
"Approximately 1,000 students commute between El Paso and Juárez", university officials said.
Delays were already rising at several key border crossings as Trump ratcheted up pressure on Democrats in Congress to toughen U.S. laws against illegal immigrants, threatening to hurt the USA economy in the name of border security.
To try to address the problem, the administration in late January started returning some migrants to Mexico to wait out their US court dates in Mexican border cities.
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