A chief figure in Formula 1 has revealed the reasons for the breakdown in his relationship with Christian Horner.
The Red Bull team principal was embroiled in controversy earlier this year, when he was accused of alleged 'inappropriate behaviour' by a female employee at the beginning of this season.
Zak Brown admits Christian Horner relationship breakdown
Horner has not only been criticised internally, but also by rival team bosses - including McLaren CEO Zak Brown.
The 52-year-old recently condemned Horner’s response to the collision between Verstappen and Lando Norris at the Austrian Grand Prix, criticising him for not calling out Verstappen's behaviour.
In a recent interview with the BBC, Brown revealed the extent of his relationship breakdown with Horner, amid multiple public rows between the pair in recent seasons.
"I've known Christian for about 25, 30 years. We used to race against each other. I would say we used to get on," he said.
"I believe in transparency. I believe in putting your hand up when you get something wrong. The cost cap, the excuses behind that, I never really heard a 'we just got it wrong'. I heard excuses and not taking ownership.
"When someone breaches the cost cap, and doesn't seem to kind of take it seriously, that's kind of hitting the integrity and core of the sport.
"To me, it's not personal. It's protecting our sport, and when I see things not consistent with our values, I'm going to speak up about it because it's important people understand where we're coming from.
"I realise that's not necessarily always going to be popular, or make friends with everyone in the pit lane, but as long as I'm friends with McLaren, our fans, our partners, that's what's most important to me."