Introduction
I. Terrorism threat and existing vetting
A. Exaggerated claims of terrorism threat from foreign born persons
B. Strict vetting for visas
C. Intensive national security checks
D. In-person vetting: the visa interview
II. The "Muslim ban" and "extreme vetting"
A. Identity verification, information sharing, and the Muslim ban 3.0
B. Identifying applicants warranting "additional scrutiny"
C. What is "additional scrutiny"?
D. Ideological vetting
E. Extreme vetting by algorithm
III. Costs of Muslim ban and extreme vetting
A. Economic costs
B. Cost to American values
Conclusion
Endnotes.