Mehmet Hakan Atilla, 48, the former deputy director general at Turkish state lender Halkbank, was released from prison in US last week after more than a year jail term over violation of US sanctions on Iran.
Turkish President Recep Tayyip Erdogan strongly criticises recent US court verdict in Turkish banker case, warning that bilateral legal accords with Washington are losing validity.
Zarrab has agreed to cooperate with US prosecutors as a witness against Turkish bank executive Mehmet Hakan Atilla, the deputy general manager of Halkbank.
Turkish President Recep Tayyip Erdogan's first meeting with Donald Trump since Trump became US president is expected to reboot relations. But the two sides have much to discuss.
Halbank denies any wrongdoing in its foreign trade transactions after Mehmet Hakan Atilla was arrested last month on charges of conspiring to evade US sanctions on Iran.
The US accuses Halkbank Deputy Chief Executive Mehmet Hakan Atilla of helping gold trader Reza Zarrab to violate US sanctions against Iran.
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