On the medical side just supply evidence as to what the treatment was and how it is not available in the US.
Presumably he has this from his US medical team who suggested he travel.
Despite the infants being US citizens, Christina Salazar and all four of her children were put on a plane on 11 December
https://www.theguardian.com/us-news/2024/dec/17/texas-newborn-twins-mother-ice-deportation
Old Joe has been busy.