Bulgaria's nationalist party Ataka, a key ally of the minority government, has given Prime Minister Boiko Borisov a stern warning following his refusal to call a referendum on Turkey's EU candidacy.
Ataka leader Volen Siderov told a rally of supporters in the southern city of Plovdiv last Wednesday that his party no longer supports Mr Borisov unconditionally.
Hours earlier, Mr Borisov's GERB party backed its bitter foe - an opposition ethnic Turkish party - to kill an Ataka refer...
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