A former shadow Welsh Secretary has been prevented from seeking selection to be the Labour candidate for the new constituency of Neath and Swansea East.
Neath MP Christina Rees was barred from standing due to her suspension from the party over allegations of bullying staff, BBC Wales has been told.
The current MP for Swansea East, Carolyn Harris, was selected unopposed to fight the next general election.
Ms Harris said she was “delighted” and Ms Rees has been asked to comment.
At the next general election the number of Welsh MPs will be cut from 40 to 32 following a UK-wide review of the electoral map.