“its destructive regional behaviour, particularly in Syria and Iraq”

Would that be in helping Syria defend itself from Sunni terrorists coordinated/imported, trained, armed, supplied, financed, and directed by the US and its co-conspirators, or in helping to defeat IS – which even US intelligence acknowledges received its biggest boost when the US and aligned states chose to back Sunni terrorists in Libya, Syria, Lebanon, Jordan, Turkey, and Iraq?

“the International Atomic Energy Agency has repeatedly affirmed Iran's technical compliance”

Just as it had complied with its NNPT obligations prior to the agreement ...

“If Congress decides that Iran is in breach of JCPOA”

It will be contradicting the assessment of its own intelligence agencies, the broader intelligence community, and the UN.