Cruz was not wrong at all.
Trump is a shrewd operator and is taking this completely out of context.
The amendment to the Bill mentioned was a poison pill Cruz was trying to insert into the gang of 8 legislation (which Rubio helped author) to expose that the Dems were not interested in anything but getting votes from illegals. He knew it would fail, but wanted to punctuate what the Dems were doing at the time.
It simply stated, okay, if you do this you have to put in the bill that they cannot vote. The Dems voted it down thus exposing their true agenda.
Cruz was smart...now that is being used against him in spot ads that take advantage of the squeeze play he was putting on the democrats.
In the end, either Trump or Cruz will be immeasurably better than Hillary or sanders.
But, as I say, Trump is playing a deft political game here, and sadly, because of that Cruz had to say at the time to try and expose the democrats, he is able to use that against him in the primaries.
There’s the problem: the average American doesn’t see it that way.