Even if the government does not lift a finger to find illegal immigrants, many will come to the attention of law enforcement officials because of their violations of other laws. But, even then, there is no assurance that they will be deported -- and certainly not in "sanctuary" cities.
Why are there immigration laws in the first place? For the benefit of the American people -- not for the benefit of people in other countries who want to come here.
But political and media elites treat the American people as if they are the problem -- a problem to be circumvented with sophistry and pious promises about border security that have not been kept in all these years since the last amnesty, decades ago.
Making an irreversible decision to add millions of people -- and their dissimilar cultures -- permanently to the American body politic is something that should take months of careful examination and discussion, both inside and outside of Congress. But it is likely to get less time than you would take to decide whether to buy a house, or perhaps even a car.
What should American immigration policy be? It doesn't matter what any of us think that policy should be if the borders are not secure, because whoever wants to come across that border will come across anyway, in defiance of whatever the policy might be.
If legal benefits are conferred on illegal immigrants before the border is secured, we may as well give up any pretense that we have an immigration policy, because benefits conferred are never going to be taken back, no matter how porous the border remains.