Trump is feeling the heat. If you read the whole article you will find this quote by Trump:
He denied that the ordeal was helping him by making him more recognizable. ‘This is not good for my brand, I think it’s bad for my brand. Maybe I’m leading in polls, but this is certainly not good. I lose customers, lose people,’ he said.
I predict Trump’s interest in the presidency will evaporate before the end of the year. Hopefully he endorses Cruz on his way out.
If you're a serious candidate for President, losing 'customers' is secondary. Trump talks a good game on immigration, granted, but his party history, contributions to Democrats and 2008 support for Obama belie any sort of claim he might have to conservatism.
Cruz is just as good on immigration and a much better conservative candidate.