The 2nd Penal Court in Izmir rejected an appeal by Brunson’s lawyer on Aug. 15 and sent the defendant's petition to an upper court.
Brunson, who has been living in Turkey for more than two decades, was accused of helping supporters of the U.S.-based Fethullah Gulen who Turkish authorities say masterminded the 2016 coup attempt in which 250 people were killed.
He was also charged with supporting the Kurdistan Workers’ Party (PKK).
The continued detention of Brunson has become a lightning rod in strained relations between Turkey and the U.S., leading Washington to slap economic and political sanctions on its NATO ally.
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