Trump did not say this about tariffs, President John F Kennedy did.

This act recognizes, fully and completely, that we cannot protect our economy by stagnating behind tariff walls, but that the best protection possible is a mutual lowering of tariff barriers among friendly nations so that all may benefit from a free flow of goods. Increased economic activity resulting from increased trade will provide more job opportunities for our workers. Our industry, our agriculture, our mining will benefit from increased export opportunities as other nations agree to lower their tariffs. Increased exports and imports will benefit our ports, steamship lines, and airlines as they handle an increased amount of trade. Lowering of our tariffs will provide an increased flow of goods for our American consumers. Our industries will be stimulated by increased export opportunities and by freer competition with the industries of other nations for an even greater effort to develop an efficient, economic, and productive system. The results can bring a dynamic new era of growth.

https://www.presidency.ucsb.edu/documents/remarks-upon-signing-the-trade-expansion-act