The. Legal. Process. Is. Broken.
If illegals thought they could enter legally they would enter legally.
They have been entering illegally for decades, under democrat and Republican administrations. The last major deportation was in the 1950s.
But more important than entering is staying. That is how there got to be so many of them.
And that has worked for them. Little downside, since very few are ever deported. Instead they enjoy a better standard of living, and send some money back home for awhile.
For all the tough talk, the most conservative Republican President put in place amnesty in 1986. Not a democrat, but Reagan no less. (I know, I know Reagan's apologists always say he claimed it was a mistake, like his abortion plan as governor, etc.)
Some form of normalization is likely. I favor legal residence for some qualifying workers, with chance for citizenship only with many conditions, and a long wait.
But as a practical matter, it doesn't make much difference to illegals, since it hasn't mattered much for decades. For long enough for them to marry here, have citizen children and grandchildren.
I went on a vacation and stopped where I lived aa a small boy, Fort Morgan Colorado. On the street I lived on, I talked to a woman. She stepped in when I started to talk to her grandfather, who spoke only Spanish.
They moved there from East Los Angeles, following the Rodney King riots in LA. Apparently had family there, too. Her experience and my own have more in common than initially might come to mind.
The California town I moved (back) to from Colorado is now dubbed "Guadalahabra" (from La Habra, since it has many Hispanics). The town next door is Whittier, home to Richard Nixon as a congressman. My mother's hometown, where her elementary school pictures in the 1930s include many brown faced school children.
The fact is people have crossed from Mexico into California, Texas, New Mexico since the Spanish colonial era, and a massive wall isn't going to stop it. (And back, too.)
If you live where Hispanics are 5% or less, and only recently--consider California, Texas, and New Mexico are at least 38%.
It may seem feasible to deport less than 5%, but it is known to be ridiculous to people living with 38%, most of them citizens or legal residents.
Finally how to deport them? Do we question people on the street? Make them sew a sombrero on their clothing?
The loudest voices in "conservatism" include calls for deportation. That will not happen. America's voters are not calling for it. If you continually find yourself among those calling loudly for unpopular outcomes, plan on being frustrated and angry.
Deportation will not happen.