Not true.
Trump paid the contractor. It is the contractor who stiffed the workers. It is also the contractor, not Trump, who hired the illegal Polish workers.
Frankly I hope Trump uses ALL of the illegals here to build the wall, on the Mexican side of the border of course!!! BOOM wall goes up and they are stuck on the other side, PERFECT solution!!! Plus they would have a little pocket money to start life over in Mexico!!!!
I find it humorous that the same people who are blaming Cruz for everything that any subordinate of his may have done are defending Trump from exactly the same situation.
And, if Trump was "ignorant" of the situation, it was only because he was intentionally maintaining "plausible deniability" about it.