Turkish President Tayyip Erdogan warned on Friday that bilateral legal accords with the United States were "losing validity", lashing out at Washington over the conviction of a Turkish banker in a US trial.

A jury in a US federal court on Wednesday convicted an executive of Turkey's majority state-owned Halkbank, Mehmet Hakan Atilla, for evading Iran sanctions in a case Erdogan has cast as a political attack against his government.

In his first public comments since the verdict, Erdogan told a news conference that if this is the US understanding of justice then "the world is doomed".

The case was based on the testimony of a wealthy Turkish-Iranian gold trader, Reza Zarrab, who pleaded guilty to charges of leading a scheme to evade US sanctions against Iran and implicated top Turkish politicians, including Erdogan.

Turkey says the case was based on fabricated evidence and has accused US court officials of ties to the cleric blamed for a 2016 coup attempt.

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