From the exit polling, here:
More than six in 10 GOP voters in Wisconsin think undocumented immigrants should be offered a path to legal status, on track to be the highest of any state this year (it’s topped out at 59 percent in Virginia). Only a third support deporting undocumented immigrants, fewer than in previous primaries. Deportation voters have been a strong group for Trump in previous primaries; Cruz beat Trump in recent contests (North Carolina, Missouri and Illinois) among the larger group that favors a path to legal status, and Kasich won them in Ohio.