What is Germany's political 'firewall' and can it keep out the AfD?

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Alternative for Germany, or AfD, has established itself as a significant political force in the 13 years since its founding, but it has never been part of any state or federal government. That’s a result of what is often called a “firewall” against cooperation with the anti-immigrant, far-right party. France 24's Philip Turle explains.

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