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Jeremy Corbyn will campaign today in one of the most marginal seats in Wales.

The UK Labour leader will say that Theresa May’s proposed Brexit deal is “bad for Wales” when he visits Preseli Pembrokeshire.

Former Welsh Secretary Stephen Crabb held onto the constituency in last year’s election with a majority of just 314 and it is considered a key Labour target seat. In the Assembly, it is represented by newly elected Tory group leader Paul Davies.

Mr Corbyn will visit a First Milk dairy and make the case for a new customs union linking the UK and EU.

The Labour and Tory votes in Preseli Pembrokeshire

Welsh Labour figures are at the forefront of calls for a second referendum but Mr Corbyn argues he could deliver a “jobs-first Brexit deal”.

The visit comes ahead of a EU Council meeting on Tuesday at which Theresa May wants to nail down support for the Brexit deal she has negotiated.

Jeremy Corbyn: Theresa May’s deal is not the right one for Wales

(Image: PA)

Mr Corbyn said: “The Prime Minister’s Brexit deal is bad for Wales, Welsh workers and Welsh communities. We will not back a Brexit deal that damages jobs, rights and the economy in any part of the UK. That is exactly what the Conservative government’s botched deal does.

“This deal will not deliver the frictionless trade that Welsh businesses rely on. It does not include plans for a comprehensive new customs union, with a British say in all future trade deals and arrangements, or a strong single market relationship for both goods and services, something which is vital to ensure the easy sale of agricultural produce as well as protecting manufacturing jobs here in Wales.

“Agriculture must not be left behind by Theresa May’s race to drive down standards. We don’t want chlorinated chicken and we don’t want Welsh workers to have worse pay or conditions than European workers.

“Theresa May’s deal is not the right one for Wales. We can and must do better. There is a deal which would command the support of Parliament, a jobs-first Brexit deal which Labour is proposing.

“If this government isn’t up to negotiating it then they should stand aside and let Labour get on with the job.”

The Tories say Mr Corbyn should visit the local hospital

Conservative Assembly leader Paul Davies was not impressed by Mr Corbyn’s remarks.

He said: “It’s rich for Jeremy Corbyn to say that the Brexit deal is bad for Wales when what people want is certainty: he is adamant to vote against it and his frontbench can’t decide whether they want to leave the EU or overturn the wishes of Welsh and British voters.

“The UK Government have agreed a good deal which will bring back control of our laws, our money, and our borders in accordance with the mandate of the referendum result. It’s about time that Jeremy Corbyn and the Labour party stop playing party politics and respect the wishes of the people by supporting the Prime Minister and this agreement.”

Mr Davies added: “Perhaps he should use his visit to Pembrokeshire to highlight the Welsh Labour Government’s abysmal record on health, where his Labour colleagues have taken away services from Withybush Hospital in recent years and they are now failing to intervene to stop the hospital being downgraded to a community hospital which includes the closing of the A&E department.”