Only a couple years ago, manufacturers were fighting for space to relocate their operations to Monterrey, an industrial city in Mexico’s northeast, as they sought to move closer to the US and its vast consumer market.

U.S. Commerce Secretary Howard Lutnick said on Sunday that tariffs on Canada and Mexico will go into effect on Tuesday, but that President Donald Trump will determine whether to stick with the planned 25% level.

Once the tariffs start, gas prices could shoot up 15 cents a gallon or more at the pump relatively soon, according to a top oil and gas expert.