An important skill for political leaders is knowing how to use leverage to get someone else to do one's own dirty work. It's the kind of thing LBJ did all the time.
The Kings of Saudi Arabia have for years saved their people from fighting wars by conning America into doing its fighting, as in the First Gulf War, for example, just as the Brits used to employ Gurkhas for jungle fighting. Australia hires Papua-New Guinea to house its refugees; the list goes on.
Let's do a little of this ourselves, vis-a-vis the surge of young Central Americans now flooding into south Texas after long trips through Mexico. Let's cause Mexico to control its own southern border, to prevent this migration.