Martin Schulz, chancellor candidate of the German Social Democrats (SPD), speaks on immigration and integration at an event co-hosted by the Berlin Inistitute for Empirical Integration and Migration Research on August 15, 2017 in Berlin, Germany. Schulz will face German Chancellor Angela Merkel, who is seeking a fourth term, in federal elections scheduled for September 24. Immigration has been a big political issue in Germany, especially since the wave of migrants and refugees arrived in 2015-2016.