![Sport | 'An issue for all of F1': Mercedes boss calls for transparency in Christian Horner investigation](https://cdn.newsserve.net/en/knowledge/Christian-Horner_20190116.jpg)
Sport | 'An issue for all of F1': Mercedes boss calls for transparency in Christian Horner investigation
Mercedes team principal Toto Wolff has called for transparency into the investigation involving Red Bull boss Christian Horner.
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