A supporter of the "no" vote, holds a Turkish flag during a protest regarding Sunday's referendum outcome, on the Aegean Sea city of Izmir, Turkey, Tuesday, April 18, 2017.
The main opposition Republican People's Party (CHP) and the pro-Kurdish People's Democratic Party (HDP) said they would challenge the results from most ballot boxes due to alleged violations.
The French government said it would "follow with great care" the worldwide monitors' final report in coming weeks, particularly in relation to a reported last-minute change of rules by the electoral boards to allow ballots that had not been officially stamped.
In a blow to the prestige of the president, the "No" campaign notched up the most votes in Turkey's three biggest cities of Istanbul, Ankara, and Izmir.
To most people who voted on Sunday's constitutional referendum, a new dawn has broken over Turkey.
Turkish authorities should launch "transparent investigations" after global observers criticized the fairness of the voting process during the recent referendum, a spokesman for the European Commission said Tuesday.
On 16 April, slightly over 51 percent of Turkish voters agreed to constitutional amendments that give greater executive powers to president Recep Tayyip Erdogan.
"Calling people to the streets by using various communication channels and refusing to recognize the results is never acceptable", Yildirim said. The assessment drew a harsh rebuke from Erdogan and criticism from Prime Minister Binali Yildirim.
Turkey's main secularist opposition said it will launch an appeal against the result this afternoon.
A prosecutor will now consider whether to press charges against Guven.
Government spokesman Numan Kurtulmus told parliament Tuesday that the state of emergency serves to purge the network of USA -based cleric Fethullah Gulen.
The European Commission's request is a direct response to the Organization for Security and Co-operation in Europe election monitor's preliminary conclusion in which it said Turkey's referendum was not impartial and instead favored President Recep Tayyip Erdogan amid "limitations on fundamental freedoms". "From the German government's point of view, Turkey must. clear up the questions that have been raised".
Erdogan, whose narrow victory laid bare the nation's divisions, told flag-waving supporters that foreign election observers should "know their place" and Turkey did not "see, hear or acknowledge" criticism that the vote did not live up to worldwide standards.
Unlike European leaders who expressed reservations about the referendum, US President Donald Trump telephoned Erdogan to congratulate him on his victory.
Meanwhile, Foreign Minister Mevlut Cavusoglu has said that a critical report by European observers on the referendum contained several mistakes which he believed were deliberate. "After our president and Trump confirmed a meeting in May, [US Secretary of State Rex] Tillerson and I will set a date", Cavusoglu said.