Former Plaid Cymru AM Neil McEvoy says he has withdrawn an application to re-join the party after he was expelled.
He said he had made the decision due to claims of an absence of "natural justice" and "due process."
In a letter to the party, the South Wales Central AM alleges two members of the panel that was to decide his fate had "expressed prejudiced views" about him.
Mr McEvoy also claims he had concerns over the timing and legal representations.
In a statement Plaid Cymru said:
We can confirm that Mr McEvoy has withdrawn his membership application. As a result, the process that was underway has ended, as there is no decision to be made.