Plaid Cymru has refused approval for a coalition group to run Conwy County Council.
Council leader Gareth Jones formed a new cabinet at Bodlondeb earlier this week, made up of five Plaid councillors, four Conservative members and one independent councillor.
But the party’s chairman Alun Ffred Jones said Plaid councillors would form an administration involving the Tories. The decision was made at a meeting of the National Executive Committee.
Gareth Jones, who was elected as the council’s new leader following the local elections, said he was ”very disappointed” and demanded a ”detailed and thorough explanation” for Plaid’s decision. He added it would negatively effect the authority’s work locally.
One of the Plaid members of the new cabinet, Trystan Lewis, has since resigned from his post as member for primary education and the Welsh language. In a Facebook post, he said while his loyalty to the party was absolute, his presence had put Plaid in a ”difficult position” and he was sad to lose an opportunity locally.