I wouldn't give much credence to anything Sarkozy says until after the end of the elections (or never, depending on your point of view). Right now he just wants to get as many votes as possible and even threatened to exit the Schengen zone (common external borders, no internal borders), like that would change the number or nature of migrants (legal or otherwise).
Plus, the French have a wonderful Constitutional Council, which has been known to shoot down any far-fetched ideas on limiting human rights (like the recent law on punishing genocide denial, which was deemed unconstitutional).
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