A meeting of Labour's national executive committee was today due to consider a motion passed by the local party on Friday, calling for the selection process to be reopened.
But Lothians Labour MSP George Foulkes claimed the bid to deselect Ms Moffat, MP for the constituency since 2001, was "completely out of order".
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Hide AdHe said: "Anne was reselected and the NEC approved it. My reading of the constitution is you can't then reopen it."
Friday night's meeting in Prestonpans Labour Club voted 25-5 to call for the selection process to be reopened, but police have confirmed they were called to the club and dispersed 20-25 people who were outside the premises.
Lord Foulkes said: "All the people outside were party members normally allowed in to the meeting. Some were delegates, but they were ruled out on a technicality."