Turkish President Recep Tayyip Erdogan has called Germany's ruling politicians "enemies of Turkey" who deserve to be rejected by German-Turkish voters.
"The Christian Democrats [CDU], SPD [Social Democrats], the Green Party are all enemies of Turkey," he said.
German ministers protested angrily.
Foreign Minister Sigmar Gabriel said Mr Erdogan's comments were an "unprecedented" act of interference in Germany's sovereignty.
Note EU-Digest: the list of "looney" world political leaders is getting longer by the day.
Read more: Turkey's Erdogan says German leaders are enemies - BBC News