ISTANBUL—Turkish President Recep Tayyip Erdogan said Saturday that he had ordered 10 foreign ambassadors who called for the release of a jailed philanthropist to be declared persona non grata. The envoys, including the U.S., French, and German representatives in Ankara, issued a statement earlier this week calling for a resolution to the case of Osman Kavala, a businessman and philanthropist held in prison since 2017 despite not having been convicted of a crime. Describing the statement as an “impudence,” Erdogan said he had ordered the ambassadors be declared undesirable. “I gave the instruction to our foreign minister and said ‘You will immediately handle the persona non grata declaration of these 10 ambassadors,’” Erdogan said during a rally in the western city of Eskisehir. He added: “They will recognize, understand, and know Turkey. The day they don’t know or understand Turkey, they will leave.” The diplomats, who also include the ambassadors …