![Red Bull have struggled this season with Pirelli tyres. Luca Bruno / AP Photo](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/UXGWFHRVOPS7N3KRUW5TSIZ5ZA.jpg?smart=true&auth=0eee91cab734ac1eef40345fd1ea453ee61762a10d888cbd1d30cb5d0d2adafa&width=400&height=225)
Red Bull have struggled this season with Pirelli tyres. Luca Bruno / AP Photo
Red Bull have struggled this season with Pirelli tyres. Luca Bruno / AP Photo
Red Bull launch protest against Mercedes
Rivals accused of secret test with Pirelli ahead of Monaco Grand Prix after principal Christian Horner cites lack of transparency.