Responding to Dafydd Elis-Thomas's decision to leave the Plaid Cymru Assembly Group, a spokesperson for the party's Dwyfor Meirionnydd constituency committee said:
"We thank Dafydd Elis-Thomas for his work for the party and the constituency since 1974.
"We are saddened and disappointed by his departure.
"The local constituency committee now appeals to his conscience and requests that he stands down in order to allow for a by-election.
"We will be making no further statements at present."