Erdogan has claimed the testimony by the Turkish gold trader in New York is a trick by US-based Muslim scholar Fethullah Gulen to undermine his government.
A trial playing out in New York is being watched carefully in Turkey.
That’s where a banker accused of helping to launder money for Iran is from. And wrapping up his testimony on Tuesday was gold trader Reza Zarrab, who has levelled corruption allegations against Turkey’s top leadership.
While the case isn’t getting a lot of attention in the US, it could spell trouble for US relations with Turkey.
Al Jazeera’s Kristen Saloomey reports from New York.