Joanna Cherry has ruled out standing for Ruth Davidson’s Holyrood seat in next year’s Holyrood election.
The SNP’s Edinburgh South West MP was planning on seeking support from her party to challenge for the Edinburgh Central constituency.
But Ms Cherry has said a rule change approved by the SNP’s governing body now means she would have to resign as an MP first.
Angus Robertson has already announced plans to bid for the candidacy.
Ms Cherry, who hit the headlines last year after successfully leading a legal bid to stop the UK Parliament from being suspended for five weeks, described the rule change as “unreasonable”.
She said: “It is unprecedented in our party’s history of dual mandates to demand that a parliamentarian make themselves and their constituency staff