On Sunday Erdogan told supporters that Turkey could consider reintroducing the death penalty, which it had abolished in 2004 as part of its longstanding European Union membership bid.
"Germany and the European Union have a clear stance: We fundamentally reject the death penalty", Xinhua news agency quoted him as saying.
Germany, Austria and France also warned separately that bringing back the death penalty, which Turkey abolished in 2004, would undo years of membership talks that began in 2005.
"In that context, we need to say clearly: it raises profound and worrisome questions when on the day after the coup attempt, 2,500 judges are removed from their posts", he said, according to AFP.
The coup plotters sent warplanes firing on key government installations and tanks rolling into major cities on Friday night.
Speaking after meeting European Union counterparts in Brussels, Kerry said he had also made clear to Turkey it must provide evidence that withstands scrutiny when requesting the extradition of US -based cleric Fethullah Gulen, who President Tayyip Erdogan has blamed for the attempted power grab. But they also revealed their deepening frustration with his government's actions over the last three days.
"It is exactly what we feared", Johannes Hahn said.
While they illustrated the deepening frustration with his government's response to the failed coup, which has even included allegations by Turkish government ministers of US complicity in the violence.
"There's a whole separation of time which has changed attitudes of some people", he said, adding that in the face of common threats such as Islamist militancy, the EU-U.S. partnership was "as important as it has ever been". Merkel's spokesman said the quashed coup hasn't affected an EU-Turkish arrangement for stopping migrants arriving by sea.
Referring Gulen, Kerry called on Turkey to furnish evidence "that withstands scrutiny", rather than allegations.
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