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Lord Dafydd Elis-Thomas has told ITV News why he resigned from Plaid Cymru.
The former leader was frank in criticism of what he saw as Plaid Cymru's failure to respond "sufficiently strongly" to the challenges of Brexit - and has not ruled out joining the Welsh Government.
The Welsh Conservatives have said they won't fight over the title of "official opposition" after news Lord Dafydd Elis-Thomas was to quit Plaid Cymru's Assembly group.
In a statement the party said they would continue "holding the Welsh Government to account."
Plaid Cymru have said they will hold a by-election to replace Lord Elis-Thomas "at the earliest convenience."
A spokesperson for Dafydd Elis-Thomas local party has issued this statement about his decision to quit Plaid Cymru in the Assembly.
Plaid Cymru have tonight confirmed that Lord Dafydd Elis-Thomas has quit the party's Assembly Group.
The Dwyfor Meirionnydd is a former leader of Plaid Cymru.
Responding to his decision, a party spokesperson said consituents can expect a by-election at the "earliest convenience".
Latest ITV News reports
Elis-Thomas has quit the party he once led, prompting speculation about a rôle in Government - and Plaid's status as official opposition.