Soumaya Keynes of the Economist and PIIE Senior Fellow Chad P. Bown explore the US Department of Commerce findings that imports of steel and aluminum threaten national security and the recommendation that President Trump impose new trade restrictions. They speak with Jennifer Hillman (Georgetown Law) about the trade law in use (Section 232 of the Trade Expansion Act of 1962), the differences between the proposed tariffs and quotas, the likely costs of such a decision, and the implications for the WTO system.