Easy ways to understand Trump:
1. his strategy - Spend, Shout, Spend, ...
2. his tactics - go/do A: spend, shout
- go/do B: spend, shout
- go/do C: spend, shout
- etc. etc. etc.
3.his logical plan- none
4. his understanding of issues - none
Why now picking on immigration? No apparent reason; possibly personal feelings, possibly it just happened. There is no obvious reason demographically or politically why this would lead to a GOP presidential nomination.