Following the conclusion of practice at the Qatar Grand Prix on Friday, Horner was asked for his thoughts on Andretti potentially making up an 11th team on the grid.
He told Sky Sport Italia: "This is a question you should ask [Formula 1 CEO] Stefano [Domenicali]. It’s all about money, and it’s very political.
"It would help if you asked him what he wants from this sport.”
Domenicali has previously said that should Andretti be allowed to join F1, it would 'not be about money', and that there are 'positives and negatives' to explore during the deliberation of the bid.
After the FIA approved the bid last wee, an F1 spokesperson told GPFans: “We note the FIA’s conclusions in relation to the first and second phases of their process and will now conduct our own assessment of the merits of the remaining application.”
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