It's customary for state officials of a car-producing nation to prefer local manufacturers for their transportation needs.
For example, German dignitaries will mostly be seen on TV stepping out of a Mercedes, BMW or Audi; their British counterparts choose brands like Jaguar, the French large Peugeots or Renaults and so on.
It's also natural to promote their domestic products, though we haven't heard of any law specifically prohibiting the purchase of certain brands for all government agencies. Until now, that is.
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