While the hearing is ongoing, Horner is staying on as team principal with the world champions, and has been present at pre-season testing in Bahrain - which is taking place this week.
“McLaren holds themselves and all the men and women at McLaren to the highest standards. Obviously, diversity and equality and inclusion are extremely important to us, our partners, to everyone in Formula 1.
"As FIA and Formula 1 has said, they need to handle it swiftly because I don’t believe these are the type of headlines that Formula 1 wants or needs at this time," the McLaren chief continued.
"I just think it’s important that it’s handled in a transparent way in which there is no doubt and no doubt whatsoever that it has been handled appropriately and whatever the conclusion is that that conclusion is handled in an appropriate, transparent manner."