German Chancellor Angela Merkel was due in Istanbul Sunday to press Turkey to stem the flow of migrants into Europe, a day after a German mayoral candidate was seriously wounded in a "racist" stabbing, AFP reports.

Her meeting with Turkish President Recep Tayyip Erdogan, who has heaped scorn on Europe's efforts to deal with the crisis, comes with her government's migrant policies fueling growing tensions in Germany, triggering a backlash from her conservative allies and spawning a growing number of increasingly vocal far-right protests.