You know why he is harping on the kids angle?
B/C he is very clever at sucking the dems in to their own traps.
1: Raise enough outrage about the separated kids.
2: Who will save the kids, somebody think of the children.
3: Easy - build the wall and stop them coming. Problem solved, thankyou dems now you can't argue against the wall or you are also all about harming kids.
Checkmate 4D
This is the exact strategy they used with the illegal boat people coming to Australia. Gave them enough rope to be outraged about the death rate on the boats, which gave the government the leverage to force the boats to stop before they launched. All with the nice humanitarian reason of 'preventing deaths at sea on the hazardous voyage' and not 'we don't want any more brown people'