Hamilton says F1 has 'a lot of work to do' to fight discrimination

has called Red Bull chief Helmut Marko's comments about 'completely unacceptable'.

Marko, 80, referred to Mexican Perez's background when discussing his driver's inconsistent form this season.

Speaking after the Italian Grand Prix earlier this month, Marko, Red Bull's motorsport adviser and an ally of the team's late co-owner Dietrich Mateschitz, said: 'Let's remember that he (Perez) is South American and so he is not as focused as or was.'

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