US Secretary of State Mike Pompeo has confirmed that Hook will step down and that “following a transition period”, US Special Representative for Venezuela Elliot Abrams will take on the Iran role.
"Brian Hook has decided to step down from his role as the US Special Representative for Iran and Senior Adviser to the Secretary", Pompeo said in a statement.
Abrams will be the special envoy for both countries, he added.
Hook began serving as US special envoy for Iran and senior policy adviser to Secretary of State Mike Pompeo in 2018. He previously served as the director of policy planning under former Secretary of State Rex Tillerson.