Ministers say a Tory call for more health funding would force bigger cuts elsewhere.

BBC: Welsh budget passed after Labour deal with Plaid Cymru

But Mr Cash, speaking to the amendment tabled jointly by Labour and a number of Tory backbenchers to remove the need for a two-thirds majority to force an early election, said the rule ran "contrary to all constitutional precedent and history since our parliament first sat".

BBC: Two-thirds dissolution rule 'is dangerous' - Tory MP