Agreed. This is where Trump has to now demonstrate he can pick up on stuff like this and make cogent arguments. He could have easily just said that Walker doesn’t understand where he stands on immigration and blasted him that way.
The fact a “businessman” like Trump isn’t aware of how well a conservative like Walker has done fixing massive fiscal problems doesn’t speak well of Trump. Wisconsin had a higher debt per capita than California before Walker took over. Unlike Jerry Brown, Walker balanced the budget by cutting government spending and actually lowering taxes.
It was an amazing feat that no one else in the US has done to my knowledge.