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When the factories start opening. Right now we are building them and Fox polling, I have to tell you, I've told you before, it's the worst polling I've ever had. During the election they had me winning by a little bit and not by a massive amount. And Fox polling, I've told Rupert Murdoch, go get yourself a new pollster because he stinks and this is for years now," Trump said.

The president argued that bringing things like car production into the United States will lead to a manufacturing boom that he expects within a year. He further claimed that many people don't like the word "tariff" because they "don't understand" it. Critics have long pointed out that tariffs historically lead to the associated costs being passed off on consumers.