The business community needs slaves. An illegal immigrant cannot sue his employer easily, fears being deported, etc. He therefore has less rights and is more effectively exploited.
They also need lower cost workers. In a state like California the cost of workers compensation can equal the cost of the wage for some workers. This is because about one in three workers compensation cases results in a lawsuit. Democracy is a marketplace for the purchasing of laws, and workers compensation attorneys have purchased sufficiently confusing law to afford themselves a profitable living. Thus, a non citizen can be vastly cheaper than a citizen to hire, even if you pay him a greater wage. If workers comp on a construction worker who makes 15 per hour is also 15 per hour, then it pays to pay the illegal 18 per hour since he will save you a net 12 per hour. Because of numerous other built-in costs for legal compliance it pays to hire illegal workers.
They also need votes for the Democratic party, and the displacement of White Americans in key swing districts. Whatever the swing districts are, you guarantee that those will be the ones that federal programs target for fastest diversification.
They also need to suppress the wages of native workers by increasing worker competition. Or as Alan Greenspan would say, "increasing worker insecurity."
These are the needs of the elites. They need the problem of illegal immigration to continue. Since illegal immigrants can obtain citizenship the pool of slaves is constantly evaporating. New slaves must be brought in to replace them. Since the swing districts change every election cycle as Whites
Amnesty would destroy the pool of slaves. Building the wall would diminish it. Neither can be allowed to happen. The Republicans are set to the task of preventing amnesty. The Democrats are set to the task of preventing the wall. The global elites need the problem to continue since it is not a problem from their perspective, but a solution. The logic of "anti-racism" is then imported to serve this need. Foundations that fund universities are then set to action promoting anti-racism. Universities become the marketing arms of corporations. Illegal immigrants are semi-slaves. Ironic how anti-racism is used to support a form of slavery, isn't it? Ideology is just marketing for power, and democracy is a marketplace for the purchasing of laws. Those ideologies that become popular are those that serve power at the time they are created. The rest rot on the shelf. Philosophies are basically marketing briefs. The Democrats and Republicans are a corporate duopoly, (like Coke vs Pepsi, or Microsoft vs Apple), that measures its profits in votes rather than dollars. They seek vote-profit maximization, nothing more.
Every dumb ass and his mother thinks the ideology is what matters. This is a "bottom up" view of things. Sovereignty is conserved. Everything is really top down. It is not the ideology that is producing power, but power that is producing ideology. The elites need slaves. What they really need is a way to legitimize morally the enslavement of the stupid in such a manner that does not require mass migration. Figure that out and you have 1/2 of a solution to immigration. Then figure out how to let Democrats always win without appealing to minorities and you have another 1/2. It's really only two problems: votes and money. Elites don't like immigrants. They like power and profit. Figure out how to give them more of that by turning against immigration and you have the solution.
They will manufacture it for you. Though it helps sell things if you have a convincing one already prepared. Perhaps "ending slavery?" Mmm? And maybe "ending wage suppression because muh economic/social justice?"