NICK CLEGG vowed last night that Liverpool CAN win major new powers, even if it votes “no” to an elected mayor – opening up a coalition split ahead of the referendum.

The Deputy Prime Minister slapped down a Conservative minister who had warned the offer could be withdrawn if the city failed to back the switch to a directly-elected leader.

The extra responsibilities – over welfare-to-work programmes, regeneration schemes and, potentially, road schemes and rail services – would be transferred as a radical "city deal".

But Greg Clark, the Tory cities minister, told the Daily Post: "It is clear that having a directly-elected mayor provides that kind of visible leadership that is necessary to be able to conclude these deals."

Just hours later, Mr Clegg asserted his authority, insisting: "There is absolutely no link whatsoever between our offer of new powers to these cities and whether they vote for a mayor or not.

"All we ask in return, as a Government is that – whether it's a mayor, or whether it's a council leader – there is strong, clear leadership in our cities in order to be able to see these City Deals through."

The public spat could have consequences for the chances of securing a “yes” vote in Liverpool, where the Conservatives wanted to create a visible prize for backing the switch to a mayor. Mr Clegg's refusal to allow that direct link will make it harder for supporters of a mayor to argue it will make a significant difference.