I don't think Trump has a political ideology...
This is all about him- if he could find another large group of people with that high a level of mindless rage he would pander to them, no matter their ideology. (I think Cruz is similar in this respect)
The man is the textbook example of someone with a narcissistic personality disorder...
https://www.psychologytoday.com/blog/stop-walking-eggshells/201511/therapists-confirm-trumps-narcissistic-personality-disorder
“Remarkably narcissistic,” said developmental psychologist Howard Gardner, a professor at Harvard Graduate School of Education.
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“He’s so classic that I’m archiving video clips of him to use in workshops because there’s no better example of his characteristics,” said clinical psychologist George Simon, who conducts lectures and seminars on manipulative behavior. “Otherwise, I would have had to hire actors and write vignettes. He’s like a dream come true.”
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“He’s very easy to diagnose,” said psychotherapist Charlotte Prozan. “In the first debate, he talked over people and was domineering. He’ll do anything to demean others, like tell Carly Fiorina he doesn’t like her looks. ‘You’re fired!’ would certainly come under lack of empathy. And he wants to deport immigrants, but [two of] his wives have been immigrants.
“There is help available, but it doesn’t look like the help people are used to. It’s not insight-oriented psychotherapy, because narcissists already have insight. They’re aware; the problem is, they don’t care. They know how you’d like them to act; the problem is, they’ve got a different set of rules."
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Licensed clinical social worker Wendy Terrie Behary, the author of Disarming the Narcissist: Surviving and Thriving with the Self-Absorbed, said, “Narcissists are not necessarily liars, but they are notoriously uncomfortable with the truth." (The article notes that Trump positions himself as a possible savior to the economy despite the fact that four of his companies have declared bankruptcy.)
He only believes in himself, and will pander to the bigots and morons on the right in order to whip them up into a frenzy.
What underlies the conservative ideology is FEAR... fear of foreigners, fear that someone might be getting something for 'free' at their expense, fear of an angry old testament god, fear that the people they have oppressed will do the same to them, fear that leads them to feel they NEED a gun to defend themselves despite the evidence to the contrary... So Trump exploits that- talks about all these rapist mexican immigrants, US Muslims cheering the fall of the twin towers, tells them he would happily torture foreigners to keep his followers safe, tells them most whites are murdered by blacks, tells them Obama has restricted their ability to get guns...
All of these things are in opposition to reality.... but it works for a large number of the conservatives....
To paraphrase Yoda: "Fear leads to anger, anger leads to hate, hate leads to Trump getting the GOP nomination"