crushing sanctions, Tehran is hell-bent on creating a nuclear weapon and the only way we're going to stop it from happening, short of an immensely destabilizing war in the Middle East, is reinstating the JCPOA...Iran is very close to achieving the necessary enrichment, and the "cost" of releasing sanctions for a JCPOA pales in comparison to what would happen without it.
If you disagree with that assessment, please describe how your approach would be better.