Turkey's opposition parties have the right to file objections to the outcome of a recent referendum on expanding presidential powers, Turkish Prime Minister Binali Yildirim said on Wednesday, but he warned that calling for street protests was unacceptable.
Yildirim said the electoral board would rule on the main opposition Republican People's Party's request for the referendum's annulment.
Dozens of opposition members were arrested in raids early on Wednesday morning, lawyers and relatives of those detained said, according to The New York Times. At least 38 people were rounded up after being accused of protesting the outcome of Sunday's referendum, in what the Times called "a crackdown on those questioning the legitimacy" of the result.
Opposition parties have complained of a series of irregularities, particularly an electoral board decision to accept ballots without official stamps, as required by Turkish law.
Yildirim said the "the path to seek rights" should be limited to legal objections. "Calling people to the street is wrong and is outside the line of legitimacy," Yildirim said, adding that "we expect the main opposition party's leader to act more responsibly."
Thousands have protested in Istanbul and Ankara since Sunday's referendum, which has set into motion the transformation of Turkey's system of government from a parliamentary to a presidential one.
Unofficial results show a narrow win for Turkish President Recep Tayyip Erdogan's "yes" campaign, which won 51.4 percent of the vote.
"The main opposition party not recognizing the results is not an acceptable thing," Yildirim said.
Electoral board head Sadi Guven said the objections would be evaluated Wednesday.
The Istanbul Bar Association announced it had filed a criminal complaint Wednesday against Guven for "wrongful conduct" and "altering the result of the election."
A prosecutor will now consider whether to press charges against Guven.
International election monitors, including from the Organization for Security and Cooperation in Europe, also noted a series of irregularities, and said the decision to accept as valid ballots without official stamps undermined safeguards against fraud and was contrary to Turkish law.
Germany also expressed concern.
"The German government takes the report by the OSCE and the Council of Europe very seriously, and we expect Turkey to do so," government spokeswoman Ulrike Demmer told reporters in Berlin. "We will follow closely how Turkey behaves on this. From the German government's point of view, Turkey must ... clear up the questions that have been raised."
Erdogan has dismissed the criticism from the observer mission, telling the monitors that they should "know your place."
"That the Turkish leadership didn't like the criticism by the OSCE's election observer mission isn't a surprise to anyone," German Foreign Ministry spokesman Martin Schaefer said.
"What matters for us is not so much the first reaction from whomever in Turkey, directed more at domestic politics, but whether the responsible Turkish authorities really deal seriously with the criticism voiced publicly by the OSCE election observer mission, which was meant seriously and researched seriously."
The U.S. response has been different, with President Donald Trump calling Erdogan shortly after the referendum to congratulate him on his win.
Turkish Foreign Minister Mevlut Cavusoglu said that Erdogan and Trump would meet in person next month, before a NATO summit. Cavusoglu said that he and U.S. Secretary of State Rex Tillerson would finalize the date according to the two presidents' schedules.
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