Trade barriers increase the costs of goods and services. And they hurt exports making our goods either uncompetitive or inviting other countries or gruops of countries to erect similar trade barriers.
There are trade barriers in every country against American goods...so I’m not worried about this. We are the biggest market and can afford to strike a better deal than we have now. Our goods are mostly uncompetitive already because of trade barriers and slave wages in poor countries hence outsourcing. We need to protect what few industries we have left and protect those new manufacturers we can create.