The existing relief of sanctions as per the JCPOA have to be re-approved by presidential waiver every 120 or 180 days in order for them to be kept in place. http://www.economist.com/news/middle-east-and-africa/21710278-outgoing-american-presidents-biggest-foreign-policy-achievement-now-looks This would make it very easy for Trump to simply un-waive them regardless of any additional sanctions he might also want to impose (though these might relate to Iran's missile development programme, which I assume is outside the NPT). The appointment of hardliners to his administration further strengthens the likely hawkish policy towards Iran.
The existing relief of sanctions as per the JCPOA have to be re-approved by presidential waiver every 120 or 180 days in order for them to be kept in place. http://www.economist.com/news/middle-east-and-africa/21710278-outgoing-american-presidents-biggest-foreign-policy-achievement-now-looks
This would make it very easy for Trump to simply un-waive them regardless of any additional sanctions he might also want to impose (though these might relate to Iran's missile development programme, which I assume is outside the NPT). The appointment of hardliners to his administration further strengthens the likely hawkish policy towards Iran.