Perhaps if they had acted 20 years ago, they might have been able to make a difference.
They are done.
Trump is not willing to do what needs to be done, unfortunately, he is my guy though and my advice would be keep the military on the border and while there discretely surround san diego and begin removal of ALL illegals, tell the rest of the country this will continue in every state, then tell them leave on your own, we will provide transportation and there will be no penalty, if we have to catch you, we put you in a tent city in arizona and make you work building the wall for 2 years then deport you to mexico, just dumped over the border, anything less is meaningless BS, Mr President want to be truly great? Here is your sign