F1 Today | Horner shocked by race director, Mercedes suppliers go bankrupt

Another day has come to an end, and GPblog, as always, has more news from the F1 world to share! Christian Horner admits that he was frustrated with the Brazilian Grand Prix race director Niels Wittich after an 'unsafe' call, a key Mercedes supplier files for bankruptcy and Guenther Steiner tells a GPblog a story about former Haas driver Nikita Mazepin.