One would think he'd be concerned with his daughters catching something but he's too far into LaLa Land to realize that could happen. Just because they're surrounded by security and go to a private school doesn't make them immune. Even he's not immune. Just let someone cough in his vicinity or he picks up a germ from a golf cart or the gal at the ice cream shop who makes his cone could pass a bug along.
He’s not at all concerned about that. He and his family are protected against all ill - foreign or domestic.
He just really doesn’t care. Even if he’s purportedly called Mexico and said they’d have to go back, he knows that won’t happen. It’s all just political maneuvering and he is trying to stem the tide of political disaster for him when the House and the Senate move out of his control.
You don't really think he cares about them, do you?
Remember his crack about not wanting them to be "punished with a baby"?
That baby would have been his grandchild.
He doesn't care about his grandchildren, he doesn't care about his children, he doesn't even care about himself.
All he cares about is "Death to the Great Satan".