Gwynedd councillor Penri Jones resigned his position as the education portfolio leader, while another seniorcouncillor resigned from the Plaid Cymru group.
His comments come in the same week a seniorcouncillor from Cornwall's cabinet resigned over an alleged plan to use what she has described as "lie detector" technology.
Briefing journalists ahead of his speech, the most senior Liberal Democrat councillor in Wales, Rodney Berman was clear that the white-hot anger which was felt on many doorsteps against his party since that deal between David Cameron and Nick Clegg in 2010 has begun to cool.
Councillor Derek Davies said a senior planning barrister had advised the authority that there is a "strong case" to challenge the secretary of state's decision.