France's top exports to the US are aircraft parts and beverages (wine).
Since the US needs those parts to export the (assembled) planes, I think the aircraft lobby (e.g. Boeing) will press hard to prevent a tariff here because it'd raise rates across the board, so that leaves wine: My hunch is even a 100% tariff on wine is unlikely to dissuade anyone from purchasing French wine -- the American wine is better, so the only people buying it are people who really wanted French wine anyway oh là là.
I don't know yet what I think about a trade war with all of Europe though.