Issues on which a GOP Candidate Could Primary Trump (Circa February 2017)

So far—what did I miss?
  1. Foreign Policy
    Taking a hardline with Russia; upholding alliances with Australia
  2. Fiscal Responsibility
    Opposing the construction of a $12-$15 billion wall and massive expansion of the federal debt
  3. Separation of Powers
    Supporting a Constitutional government
  4. Immigration
    Affording refugees a shot at freedom, regardless of their religion or country of origin