Donald Trump had a stern warning to companies thinking of leaving the United States during his Sunday morning Twitter tirade.
The president-elect says firms who outsource beyond America's borders will face a massive tax increase, while those who stay will see huge financial benefits.
In the lengthy rant, he wrote: "The U.S. is going to substantialy [sic] reduce taxes and regulations on businesses, but any business that leaves our country for another country, fires its employees, builds a new factory or plant in the other country, and then thinks it will sell its product back into the U.S without retribution or consequence, is WRONG!
"There will be a tax on our soon to be strong border of 35% for these companies. wanting to sell their product, cars, A.C. units etc., back across the border.
"This tax will make leaving financially difficult, but these companies are able to move between all 50 states, with no tax or tariff being charged. Please be forewarned prior to making a very expensive mistake."
The billionaire finished by saying: "THE UNITED STATES IS OPEN FOR BUSINESS."
Trump's plan to keep jobs and business in America was a focal point of his campaign and is key to his policy plan for the White House.
Last week he made a deal with air conditioning and heating company Carrier to keep 1,000 jobs from moving to Mexico.
He then slammed another Indiana manufacturer, Rexnord, for moving 300 positions south of the border.
"Rexnord of Indiana is moving to Mexico and rather viciously firing all of its 300 workers,' Trump tweeted on Friday. 'This is happening all over our country. No more!"
Trump announced on Thursday that he had made a deal to save a thousand jobs in exchange for about $7million in tax breaks and gains.
He told workers at the Carrier plant: "Companies are not going to leave the United States anymore without consequences."
As Trump praised his plan at the air conditioning manufacturer, Rexnord workers across the street were holding up signs that asked: "What about us?"
"Is there hope? There's always hope. But, in reality, our jobs are gone," Rexnord machinist John Feltner told the Indy Star.
News of the Carrier deal was bittersweet for the Rexnord workers, who had stood by them during protests and once saw themselves in the same boat.
Now they fear they will be left out in the cold.
His outburst came hours after he slammed Saturday Night Live for a "biased" skit about his use of social media.