President-Elect Donald Trump issued a series of six tweets Sunday morning in which he signaled his commitment to following through on his campaign promises to stand up for American workers and go after businesses threatening to outsource jobs to foreign countries.

In his tweet storm, which came on the heels of the deal he made last week with Carrier to keep a plant in Indianapolis that had been set to move to Mexico, the president-elect reinforced his staunch commitment to bringing jobs back to the U.S. and protecting the ones already here.

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“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!” Trump tweeted.

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He added, “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 UNITED STATES IS OPEN FOR BUSINESS.”

When Trump and Carrier made the deal to keep those 1,000 jobs in the United States last week — weeks before he would take office — the president-elect showed that the people and their personal concerns matter to him.

“When Donald Trump was running for president, he said that when he was elected the United States of America would start winning again. Today, America won and we have Donald Trump to thank,” Vice President-Elect Mike Pence said while introducing Trump in Indianapolis Thursday. “I got a feeling working besides this extraordinary man this is just the beginning of a lot more good news all across America.”