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Questioning the EU's Schengen Treaty

Dec 6, 2012 | 00:53 GMT

French minister for European affairs Edith Cresson (C) is flanked by Luxemburg's G. Wohlfahrt (D) and Belgium's Keersmaeker (L) in Schengen, 1990.

French minister for European affairs Edith Cresson (C) is flanked by Luxemburg's G. Wohlfahrt (D) and Belgium's Keersmaeker (L) in Schengen, 1990.

(CHARLES CARATINI/AFP/Getty Images)

One of the pillars the European Union was built upon is coming under threat....

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