Don't 'over think' Trump. There are no underlying principles, there is no long term plan and there's nothing 'between the lines'. They are illusions created 'after the fact' by  his handlers/apologists. The secret to understanding Trump is that there is no secret. When he opens his mouth, or tweets, he means what he says and says what he means; he also means what he says and says what he means moments later when he contradicts himself.