US President Trump must decide by 15 October whether he will certify to Congress that Iran is complying with its obligations set out in the nuclear deal (JCPOA). He has previously certified that it has done so twice before, in April and July 2017. If the President does not certify, Congress has 60 days to decide whether to re-impose sanctions on Iran.
The US has also indicated that it may designate Iran’s Islamic Revolutionary Guard Corps (IRGC) as a terrorist group. In response, the IRGC Commander warned that, if designated, the military wing would treat US troops, particularly those in the Middle East, as if they were Islamic State terrorists.