Kammenos is the leader of Independent Greeks, a nationalist anti-bailout party that is the junior coalition partner of Prime Minister Alexis Tsipras` radical left Syriza party.
Greece is seeking a new debt agreement with the euro zone that will allow it to shake off much of the austerity that has been imposed by a European Union/International Monetary Fund bailout since 2010.
The euro zone, particularly Germany, has shown no willingness to ease its requirement that Greece make deep budget cuts and economic reforms.
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