The USA working-poor socio-economic class and many unemployed citizens are harmed in many ways by the presence of multi-millions of illegal alien invaders.
Their presence alters the supply/demand economic law seriously adversely affecting citizen workers and the unemployed folks and benefits employers by assisting in keeping wages artificially low.
Illegal aliens due to their multi-millions inside the USA also drive up rental costs for the citizens at the bottom of the socio-economic hierarchy who too-often pay 50 percent and more of their wage for rent alone.