The other thing
You're right, sort of. You say the GOP needs illegal aliens to take American jobs. Actually you are using "GOP" interchangably with "the business community" which is not exactly accurate phrasing. Also the illegals workers are taking jobs most Americans have long stopped wanting to do themselves. Having a large pool of low wage labor is a huge economic asset to America compared to many nations in the world, although even illegal immigrants are difficult to hire for less than $15/hour nowadays. At least on the West Coast.