New York (CNN Business) The entire US auto industry would shut down within a week if President Donald Trump goes through with his pledge to close the US-Mexican border, according to a leading expert on the industry.

That's because every automaker operating an auto plant in the United States depends on parts imported from Mexico, said Kristin Dziczek, the vice president of industry, labor and economics at the Center for Automotive Research.

About 16% of all auto parts used in the United States, both at assembly plants and sold at auto parts stores, originate in Mexico. Virtually all car models in America have Mexican parts, she said. Because of that reliance, she said the auto industry would stop producing vehicles relatively quickly.

"You can't sell cars with missing pieces," she said. "You've got to have them all. I see the whole industry shutdown within a week of a border closing."

that he has been warned several times about the economic consequences of a shutdown. One administration official described the effects as " President Trump is threatening to close the border within a week as a way to stop illegal immigration. Members of his own administration have told CNNthat he has been warned several times about the economic consequences of a shutdown. One administration official described the effects as " catastrophic " and "a whole world of hurt." But the president continues to contemplate the idea of shutting the border in sections or in its entirety, according to officials.

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