Tens of thousands of (illegal) immigrants work in farm labor, and many US citizens would not be capable of performing those required tasks over the course of 12- 14 hour days, six days a week for what often amounts to less than minimum wage level pay.So...you would rather have illegal aliens have jobs that American citizens could fill?
Economic impact of illegal immigrants in the United States - Wikipedia
"The economic impact of illegal immigrants in the United States is challenging to measure and politically contentious. Since it is a challenging field to quantify, it leaves room for varying methodologies of study, and so the definitive results of the economic impact can change[1]"