Turkish Foreign Minister Mevlut Cavusoglu has threatened to resign after President Recep Tayyip Erdogan promised to declare the ambassadors of 10 Western countries ‘persona non grata’ who had called for the release of imprisoned benefactor Osman Kavala, Deutsche Welle reports.

Cavusoglu, who was in South Korea when Erdogan made the statement on Saturday, has urged Erdogan to postpone the decision until the government session in order to talk face-to-face.

“If the ambassadors are declared ‘persona non grata’, I will have to leave the ministry,” Cavusoglu told Erdogan, who said he couldn’t do anything about that.

Members of the ruling Justice and Development Party have interfered and warned about the impact that the decision will have on Turkey’s diplomatic relations with those countries, including the US, Germany, France and Canada. The political party members are trying to find concessions.

Erdogan’s threat was reported on the front pages of newspapers around the world, and yesterday the Turkish lira dropped to the lowest level in history. Later that day, the US government issued a statement stating that it is committed to Article 41 of the Vienna Convention to not interfere in the domestic affairs of another country. After this, Erdogan said the crisis has been resolved.