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The En March MP said the era of “national sovereignty” is coming to a close as the EU prepares to further integrate.

Ms O said: “Today, if we want to put the conversation in a larger framework, there is very little left of national sovereignty and we have to come to terms with the fact that real sovereignty comes through European sovereignty.

“In so many areas – like counterterrorism, the refugee crisis, climate change, the competition with the US – we are stronger together.”

Speaking to the BBC, the French politician was discussing President Emmanuel Macron’s vision for a more united EU.