Team principal Christian Horner was with Red Bull as Formula 1 preseason testing began on Wednesday even as he faces an ongoing investigation by the team’s parent company into an alleged claim of misconduct.

Horner was alongside the team’s chief technology officer, car designer Adrian Newey, as Max Verstappen drove the team’s new car at the start of Wednesday’s morning session. It is the start of the Dutch driver’s campaign for a fourth consecutive world title.