Too bad they're wrong about the cause. It's not immigration that's destroying the middle class, it's the rentier behaviour of US economic elites that are doing that. The suppression of undocumented immigrants makes skimming all the cream off easier.

ETA: if you really want to fix that issue, people need to change their thinking about unions, and then pressure their representatives to change the law that has been so successful at pushing them out of the economy.