The time for that was 25 years ago. Rounding up 35 million illegals isn’t happening. At best, the nation divides.
You can easily double that 35 million number.
Round them up might not be necessary for most. I know Romney got pillared years ago with the suggestion to remove the jobs, but I think this would take care of much—end work visas and implement eVerify for all companies for anyone they hire. Put some teeth into it. Remove the jobs, they will go home. And at that point, help create jobs in their cesspool countries. Maybe taxfree products from American companies based in Mexico that don’t compete with American companies in the US.