ANKARA – Prosecutors filed new espionage charges against Istanbul’s jailed mayor on Monday, intensifying the judicial pressure on the opposition politician seen as a top rival to President Recep Tayyip Erdogan .

The new charges against Ekrem Imamoglu stem from an investigation launched last week into alleged links between his political campaign and a businessman arrested in July for reportedly carrying out intelligence activities on behalf of foreign governments.

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Imamoglu’s former campaign manager, Necati Ozkan, and journalist Merdan Yanardag were also charged.

The state-run Anadolu Agency said Imamoglu — who his already in pretrial detention on corruption charges — is suspected, among other things, of transferring personal data of Istanbul residents as part o

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