No, just no. You’re missing the point. Poor people are poor people, some are immigrants, some are not.

Anything that benefits poor immigrants will also benefit poor citizens. Anything that enriches white nationals, will enrich the rich immigrants that can become nationals just paying money anyways.

It is your boss taking away your job and giving it to the lowest bidder. It doesn’t matter who the bidder is. There will always be someone poorer than you, willing to work for less out of desperation. Sometimes they ar immigrants, sometimes they are white nationals.