Turks vote Sunday on 26 far-reaching constitutional amendments put forward by the ruling party, which some suspect of trying to erase the Muslim country's secularism.
While the US has continued to press for UN Security Council sanctions on Iran over its nuclear program, Turkey's high-profile role in brokering a nuclear deal with Tehran is just the latest sign of an emerging diplomatic power.
In an alleged Turkey coup plot, 12 senior officers have been charged with plotting a coup against the country's Islam-leaning civilian government. It appears to be an attempt to weaken the influence of the secular military, say analysts.
Two cases have the nation on edge. While the government goes after an ultranationalist gang, prosecutors want to ban the ruling party on charges of Islamist subversion.
Court will hear arguments on whether to shutter Turkey's Islamic-rooted ruling party.