President-elect Donald Trump warned U.S. companies that moving manufacturing to other countries would be a "very expensive mistake" as they will face heavy new taxes — an approach likely to face resistance from lawmakers in his own party.

In an early-morning series of six Twitter posts, Trump summarized a plan outlining an integral part of his campaign position: that shifting production from the U.S. to Mexico, China or other lower-cost countries would be discouraged by punitive tax policy.

"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 said. "There will be a tax on our soon to be strong border of 35 percent for these companies wanting to sell their product, cars, A.C. units etc., back across the border."