Anti-European Union and populist parties registered stunning gains in European Parliament (EP) elections over the last week, finishing first in several member states, including France, the United Kingdom, and Denmark. They will use their parliamentary presence as a platform for their Euroskeptic, anti-globalizing, and xenophobic discourse. This will affect the political climate in the EU and may weigh heavily on upcoming debates of strategic importance, for instance on the Transatlantic Trade and Investment Partnership with the United States.