Andrew Brunson was jailed in December 2016 over alleged ties with the Fetullah Gulen movement; an organisation authorities believe was connected with a failed coup in Turkey the summer before.
Gulen, who's in the US, is a well-known political opponent of Turkish President Recep Tayyip Erdogan.
According to Christian charity Open Doors USA, the 50-year-old is set to stand trial before a Turkish criminal court on 16th April.
He will have to defend himself against charges of on espionage and terrorism-related accusations that could imprison him for up to 35 years, essentially putting him behind bars for life in Turkey.
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