If you work W-2 for a living, payroll taxes are taken by your employer right off the top. Why would you take an illegal job if you can work legally and probably earn a higher wage, which means that you pay those payroll taxes (DACA recipients can work legally)? Is it possible that not all Dreamers pay income taxes? Sure. As to whether immigrants provide innovative solutions that can result in the the establishment of businesses, foreign-born inventors played especially large roles in cutting-edge fields like semiconductor device manufacturing (87 percent), pharmaceutical drugs or drug compounds (79 percent), and optics (77 percent) as measured by approved patent applications. Whether those exact percentages are currently correct or not is certainly debateable (my numbers are from 2015),but that immigrants provide a greater degree of innovation than native-borns is settled. Article II, Section 3 of the US Constitution supports both Obama's and Trump's immigration executive actions.