Soumaya Keynes of The Economist and PIIE Senior Fellow Chad P. Bown explain developments resulting from President Trump’s announcement of new “national security” import tariffs on steel and aluminum. They discuss those countries hit by—and those excluded from—the tariffs, the implications for the NAFTA negotiations, and the process for more countries to seek exemption. They describe the European Union’s potential response of immediate retaliation and the imposition of its own emergency tariffs on imported steel and aluminum products due to trade deflection. They also speak with Jennifer Hillman (Georgetown Law) about the potential for WTO disputes and the WTO legality of these actions.