Diplomatic relations between Turkey and Germany have taken a hit since the implementation of the “state of emergency” and related civil society crackdown following the attempted coup in July 2016 - including more than once on German citizens. Yücel's supporters in Germany have been actively protesting against his arrest, and Merkel has publicly criticised Yücel’s detention.
Meanwhile, a reported 63.07 percent of Turkish citizens casting their ballots from Germany have voted in favor of expanding Erdoğan’s powers. The referendum narrowly passed in Turkey on 17 April – 51.41 percent “yes” – and the opposition has cried foul.
ECPMF's Kaufholz states:
"The ECPMF can only recommend President Erdoğan to take a look at 'his' new constitution, according to which the courts are independent of the government and the parliament.
Regime critics fear that the referendum, if honoured, would consolidate a dictatorship, as it would change Turkey from a parliamentary to a presidential system (meaning no more prime minister). The reform to Turkey's constitution would require that the Constitutional Court review presidential decrees, but the court may not be impartial as Erdoğan would be responsible for most of its appointments.
Another change would be that for a presidential veto to be overriden, the Parliament would need to produce an absolute rather than a simple majority. Meanwhile, the Parliament would be unable to impeach the president - but Erdoğan would be able to dissolve it at will.