Of course he can, as long as they are assimilated Mexicans who understand what makes this country great.
Finally, someone verbalizes what I have been thinking since Trump has been on the scene. Trump will get a significant portion of the Hispanic vote of the legal Hispanics. that will happen because these people do not want to be displaced and threatened by all the illegal Hispanics.
Not only that but there is a criminal element that preys on Hispanics and that is very, very frightening. This is why Trump will get a significant portion of the Hispanic vote probably in the 30-50% range.
Most Hispanics are like everyone else. They want to prosper. They want their kids to prosper and they do not want to lose it all to illegal immigration.