The ability of countries to change and manipulate the exchange rate with the American dollar will necessitate protecting the American market from a drive to the bottom to make foreign products cheaper and cheaper. The more imports are allowed to service American consumption the fewer means of creating American wealth remain.
Adam Smith warns againt importing due to being purely consumption and eventually causing middle-class poverty.
Whether through tariffs - which are not stable when currencies devalue againt the dollar or just limiting the physical importation through quotas - America cannot not allow manufacturing to be done outside of American tax jurisdiction.
As the Japanese Prime minister said: "Without the U.S. there is no TPP trade agreement." We are the consumers and all other countries are only concerned with selling, not buying, from America.
Trade should not be about buying; If you have something to trade then find something America wants to trade and then make a deal. If foreign countries don't want anything from America then we cannot want something from them. That's free trade.