Mark Levin is coming unglued about this deal today. Saying congress handed over the treaty powers of the Constitution to Obama. It will take a veto proof majority to override a presidential veto instead of 2/3 to pass it as a treaty.
The Constitution requires the same 2/3 majority to override a Presidential veto. The trick must be a some other detail(s).
Just because Mark Levin says its a treaty does not make it so. A treaty has a much higher bar for compliance by both sides. Here, it is a one sided compliance by Iran in return for removing sanctions. I don’t think any serious analyst or lawyer on the right thinks this is a treaty.