A Turkish-Iranian gold trader on Thursday told jurors in a New York federal court that Turkish President Recep Tayyip Erdogan personally authorized a transaction in a scheme to help Iran evade U.S. sanctions, Reuters reported.

Reza Zarrab is cooperating with U.S. prosecutors in the criminal trial of a Turkish bank executive accused of helping to launder money for Iran. At the time of the alleged conspiracy, Erdogan was Turkey’s prime minister.

Zarrab said he learned from Zafer Caglayan, who was Turkey’s economy minister, that Erdogan and then-treasury minister Ali Babacan had signed off on the transaction.

Erdogan said earlier on Thursday that Turkey did not violate U.S. sanctions, CNN Turk reported. A spokesman for Erdogan’s government has called the case a “plot against Turkey.”

Zarrab also said for the first time on Thursday that Turkey’s Ziraat Bank and VakifBank were involved in the scheme. Ziraat denied the allegation. VakifBank could not immediately be reached for comment.

The testimony came on the third day of the trial of Mehmet Hakan Atilla, an executive at Turkey’s state-owned Halkbank, who has pleaded not guilty in Manhattan federal court.

U.S. prosecutors have charged nine people in the case with conspiring to help Iran evade sanctions, although only Zarrab, 34, and Atilla, 47, have been arrested by U.S. authorities.

Over two days of testimony, Zarrab has told jurors that he helped Iran use funds deposited at Halkbank to buy gold, which was smuggled to Dubai and sold for cash. On Thursday, he said that he had to stop the gold trades and start moving money through fake food purchases instead in 2013, after U.S. sanctions changed.

Zarrab has said that Atilla helped design the gold transactions, along with Halkbank’s former general manager, Suleyman Aslan.