The 2014 elections brought a record number of xenophobic populist parties into the European Parliament (EP). They have a strong incentive to be more united and active than in previous terms, and they could use the Parliament to shape voter attitudes, pressure mainstream parties to adopt more xenophobic rhetoric, fragment the mainstream right, and obstruct parliamentary proceedings. The rise of xenophobic populism could affect the open society through the EU’s policies and budget if it alters EP debates on issues that split left and right, particularly Roma exclusion, migration and asylum, and EU external policies and development aid.