We have gotten to the point where there are many more whom should be rounded up then we can find the resources to do it. Sad.
Busses, trains planes dedicated to do the job - If we can fund the Green New Deal, we certainly can fund the removal of masses of illegals.
If it was done properly with the right resources, buses, plenty of agents, aviation to fly them back to their home country many of them would leave on their own just as during the Eisenhower administration. Suspend their rights to a hearing before an Immigration Judge, no appeals, no asylum, if they’re unlawfully present they’re subject to immediate removal. Advertise heavily on tv, radio, social media. Let them know that immigration agents are coming after them and a lot of them would pack up and leave.