There are limits set by the needs of capital.
“Both deportations and workplace firings face a basic obstacle—the immigrant workforce is a source of immense profit to employers. The Pew Hispanic Center estimates that, of the presumed 11 million people in the country without documents, about 8 million are employed (comprising over 5% of all workers). Most earn close to the minimum wage (some far less), and are clustered in low-wage industries. In the Indigenous Farm Worker Survey, for instance, made in 2009, demographer Rick Mines found that a third of California’s 165,000 indigenous agricultural laborers (workers from communities in Mexico speaking languages that pre-date European colonization) made less than minimum wage.
The federal minimum wage is still stuck at $7.50/hour, and even California’s minimum of $10/hour only gives full-time workers an annual income of $20,000. Meanwhile, Social Security says the national average wage index for 2015 is just over $48,000. In other words, if employers were paying the undocumented workforce the average U.S. wage it would cost them well over $200 billion annually. That wage differential subsidizes whole industries like agriculture and food processing. If that workforce were withdrawn, as Trump threatens, through deportations or mass firings, employers wouldn’t be able to replace it without raising wages drastically.
As president, Donald Trump will have to ensure that the labor needs of employers are met, at a price they want to pay. The corporate appointees in his administration reveal that any populist rhetoric about going against big business was just that—rhetoric. But Hillary Clinton would have faced the same necessity. And in fact, the immigration reform proposals in Congress from both Republicans and Democrats over the past decade shared this understanding—that U.S. immigration policy must satisfy corporate labor demands.”