Anadolu Agency said the FBI attache was "invited" to speak to officials after a former Turkish deputy police chief reportedly told a jury in New York that the FBI paid him USD 50,000 and US prosecutors covered his rent.
Anadolu did not name the attache.
State Department spokesperson Heather Nauert confirmed an FBI official was "brought into the Turkish ministry."
The American case has further strained already tense relations between Turkey and the US.
He was later arrested in a 2014 investigation for alleged links to US-based Muslim cleric Fethullah Gulen, who was later blamed for a 2016 coup attempt.
Korkmaz said he fled Turkey after the coup, with evidence allegedly showing collusion by top Turkish government officials in a money-laundering scheme evading US sanctions on Iran.
Korkmaz is testifying in the trial against banker Mehmet Hakan Atilla, who has pleaded not guilty. The star witness against Atilla is a Turkish-Iranian gold trader who pleaded guilty and said he bribed a former Turkish economy minister and the former manager of state-owned Halkbank.
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