Luckily neither one of them will decide that.

I don't mind trying to get a European spot on Artemis 3 (although I don't see NASA sending a European astronaut to the surface there), but the decision who should be made by ESA and NASA, not by politicians supporting someone from their country.

ESA has 7 active astronauts, by 2025 all of them will have made at least one half-year stay at the ISS (Andreas Mogensen is the last one with only a short flight, he is expected to fly on Crew-7 in fall 2023 for a half-year stay), four of them will have made two stays and lived on the ISS for about a year in total.