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" Erdogan, who is about to have the EU put his chair outside the door, seized the favorable moment to use the pope of all people as a crown witness for Turkish EU membership..." - Radio Vatican
* What do the texts in bold mean?
1. Does " to put his chair outside the door" mean to disclose something secret?
2. And " Crown Witness" is prime or most important witness.
It sounds as if he is about to be removed from the discussions so that the others can talk freely about Turkish accession- there are probably periods when he can be present and others when only the members are there.
The pope is not just an ordinary witness- 'crown' is used to signify royal authority (Law Dictionary).
Erdogan 
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