Clwyd South's Susan Elan Jones is among several prominent Welsh Labour politicians who have urged the party's UK leader to table a vote of no confidence in Theresa May's government.
Labour was granted an emergency debate on Tuesday on the issue after claiming MPs had been "disregarded".
But the party rejected calls to table a vote of no confidence in Mrs May, with Labour officials arguing it had more chance of success when the Brexit deal came back before MPs.
However, some Welsh Labour politicians have urged Mr Corbyn to act.
MPs Susan Elan Jones (pictured), Tonia Antoniazzi, Madeleine Moon, Geraint Davies, Chris Bryant and Owen Smith have all signed a letter to the Labour leadership from Ian Murray asking for a no confidence vote, followed by another referendum.
The Prime Minister is today meeting European leaders and EU officials for talks aimed at rescuing her Brexit deal.