Trumps own companies sought foreign workers in foreign counties with the promise of legal immigration sponsorship. Once hired his companies transport them in, on airplanes, no boarder walls involved, then gave them fake documents. So that they would think they were legal.
This was reported, factually, while he was still president. No one left or right has ever attacked him on this once. Why? Well because this is standard practice with those donating to all these politicians. All of them. They don't bite the hand that feeds. Why do both sides do nothing to fix a broken immigration system? Because broken means underpaid illegal workers companies can wring out labor from, then immediately discard. No penalty. It's perfect.
Blaming the victims of capitalism and not the capitalist class itself isn't just a thing with Trump's followers - it's literally the unspoken consensus liberal ideology rests upon.