The European Commission has indicated it will “bring forward in the next few days” a set of retaliatory measures at the WTO against U.S. section 232 tariffs on steel and aluminum. This could take two forms. Broad-based tariffs against any U.S. products could amount to $2 billion – the EU’s share of the section 232 measures – though the WTO process can take a year. Another route would be “safeguarding” investigations of steel and aluminum imports, focused on supplies from the U.S. to Europe. That could be implemented more quickly and simply. The EU imported $3.8 billion of broadly-defined...