The German government has also questioned the vote after the European Union called for a probe into the result. "That is why it is very significant", he said.
A few hours earlier, Spicer said during a press briefing that the USA will wait until the worldwide commission of election monitors completes its report: "Before we start getting into their government system, let this commission get through its work".
However, opposition parties said the exercise was marred by irregularities, adding that they would challenge its result.
The new system takes effect at the next election, now slated for November 2019.
Why are worldwide monitors concerned?
The YSK said an official complaint would be filed regarding election officials failing to stamp the ballot papers and envelopes. The Turkish Bar Association described the move as "illegal". Tana de Zulueta, head of the observer mission, told reporters that the group had paid a courtesy call and held a "cordial" meeting with board members. She offered no evidence.
"Look, the Middle East is a pretty rough neighborhood, and sometimes you have to get together to help them beat the bullies, like Syria", Sanders said.
"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", reported Reuters. However, numerous changes are expected to be implemented much sooner.
During Sunday's vote, about 51.35 per cent backed the constitutional changes, compared to 48.65 per cent for the "no" side. In their statement on Sunday, top European Commission leaders issued a similar call. Austrian Foreign Minister Sebastian Kurz went further.
The statement did not say whether Trump had raised accusations of voting irregularities during the referendum.
But the "Yes" vote has even wider implications for Turkey, which joined North Atlantic Treaty Organisation in 1952 and in the last half century has been engaged in a stalled bid to join the European Union.
The U.S. response has been different, with President Donald Trump calling Erdogan shortly after the referendum to congratulate him on his win.
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