Richard Nephew, a deputy to US special envoy for Iran Robert Malley, is no longer serving in that role but remains a State Department employee, it was reported on Monday.
A senior State Department official did not give a reason for Mr Nephew's change of role but told Reuters that personnel moves were "very common" a year into the administration.
The Wall Street Journal earlier reported that Mr Nephew left after differences of opinion in the US negotiating team on the Iran nuclear deal.
His appointment as deputy to Mr Malley, who was criticised for being too soft on Iran, had been an attempt to strike a balance on the team, with US Secretary of State Antony Blinken pushing for diversity of views on the Iran issue, US sources told The National.
This stance has delayed several appointments but Mr Nephew was an early pick for the job because of his expertise and close relationship with the Biden transition team.
Agencies contributed to this reporting
Fight Night
FIGHT NIGHT
Four title fights:
Amir Khan v Billy Dib - WBC International title
Hughie Fury v Samuel Peter - Heavyweight co-main event
Dave Penalosa v Lerato Dlamini - WBC Silver title
Prince Patel v Michell Banquiz - IBO World title
Six undercard bouts:
Michael Hennessy Jr v Abdul Julaidan Fatah
Amandeep Singh v Shakhobidin Zoirov
Zuhayr Al Qahtani v Farhad Hazratzada
Lolito Sonsona v Isack Junior
Rodrigo Caraballo v Sajid Abid
Ali Kiydin v Hemi Ahio
T20 WORLD CUP QUALIFIERS
Qualifier A, Muscat
(All matches to be streamed live on icc.tv)
Fixtures
Friday, February 18: 10am Oman v Nepal, Canada v Philippines; 2pm Ireland v UAE, Germany v Bahrain
Saturday, February 19: 10am Oman v Canada, Nepal v Philippines; 2pm UAE v Germany, Ireland v Bahrain
Monday, February 21: 10am Ireland v Germany, UAE v Bahrain; 2pm Nepal v Canada, Oman v Philippines
Tuesday, February 22: 2pm Semi-finals
Thursday, February 24: 2pm Final
UAE squad:Ahmed Raza(captain), Muhammad Waseem, Chirag Suri, Vriitya Aravind, Rohan Mustafa, Kashif Daud, Zahoor Khan, Alishan Sharafu, Raja Akifullah, Karthik Meiyappan, Junaid Siddique, Basil Hameed, Zafar Farid, Mohammed Boota, Mohammed Usman, Rahul Bhatia
Company%20profile
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Dubai Bling season three
Cast: Loujain Adada, Zeina Khoury, Farhana Bodi, Ebraheem Al Samadi, Mona Kattan, and couples Safa & Fahad Siddiqui and DJ Bliss & Danya Mohammed
Rating: 1/5
The%20Beekeeper
%3Cp%3E%3Cstrong%3EDirector%3A%20%3C%2Fstrong%3EDavid%20Ayer%C2%A0%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EStarring%3A%20%3C%2Fstrong%3EJason%20Statham%2C%20Josh%20Hutcherson%2C%20Emmy%20Raver-Lampman%2C%20Minnie%20Driver%2C%20Jeremy%20Irons%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3ERating%3A%20%3C%2Fstrong%3E3%2F5%3C%2Fp%3E%0A
