Attrition through enforcement. But even that won’t work until our borders are EFFECTIVELY secured.
The whole defeatist ‘round ‘em up’ argument originated by the pro-amnesty crowd.
If our current immigration laws are enforced, no jobs, no medical care, no Federal or State benefits...along with no banking privileges, no mortgages or auto loans...they’ll have NO CHOICE but to leave. Those who refuse should be rounded up, placed in camps along the border, forced to build a double fence, and THEN deported.
But saying this as politely as I can, it is delusional to think that what you suggest (rounded up, placed in camps along the border, forced to build a double fence, and THEN deported) is going to happen. It feels good to say it but it is an impossibility.
The Republicans and Democrats in power over the last four decades have created an impossible mess. You can not wish back time as if the mess never happened.