It's not a mobster way, more like a weasel way. The reason it is a weasel's move is because decisions at the consulate are made by consular officers who are career public workers and won't deny visas for arbitrary reasons. That is bad for the political leadership because they just don't want to issue visas. So they need to invent evasive moves to throttle the pipeline by adding trainings, background checks, and other bogus bureaucratic hurdles.
> The reason it is a weasel's move is because decisions at the consulate are made by consular officers who are career public workers and won't deny visas for arbitrary reasons.
No? Visa can be denied for arbitrary reasons based on what executive branch of US. there have been multiple cases where it has been clear that visas are a privilige not a right. Visa needs a reason to be granted, by default it is denied.
No, you are confusing discretion with whims of the executive branch. Consular officers have discretion to adjudicate the applications and they can deny them for reasons prescribed in the INA. Those decisions are not reviewable. They are still supposed to follow their training, the FAM, and the INA in making the decisions. If Rubio sends an email to the consulates that says, "deny all visas", that would be illegal as a matter of policy and will be overturned by the courts under the APA. Note that 212(f) (aka Muslim ban from Trump v. Hawaii) gives discretion to the president to bar entry into the country, not visa adjudications. Visa adjudications require individualized determination by the consular officer.