Reigniting a Transatlantic Deal  Former Italian prime minister Enrico Letta is something of a policy rock star after authoring a report on the future strategy for the EU. Most of the 146-page report focuses on strengthening the EU’s internal Single Market but, buried at the end of the long tome is the suggestion of intensifying efforts to create a Transatlantic single market. He reiterated the idea at a conference this week in Washington where it will likely receive a warmer welcome than in Brussels. His justification is sound. Europe and the U.S. share common values and interests, both would benefit tremendously from a deeper integration, and the unification may be unavoidable given the geopolitical challenge presented by the B...