President Recep Tayyip Erdogan is demanding an apology from U.S. Vice President Joe Biden over comments in which he said the Turkish leader had admitted to him that Turkey had allowed foreign fighters to cross into Syria.

Erdogan denied ever saying that and told reporters Saturday that Biden “will be history for me if he has indeed used such expressions.”

Biden told an audience during a speech at the Harvard Kennedy School on Thursday: “He (Erdogan) said: ‘You were right. We let too many people through.’ Now they’re trying to seal their border.”

Erdogan said: “I have never said to him that we had made a mistake, never. If he did say this at Harvard then he has to apologize to us.”

Source: AP