The SNP and Labour need to come together to fend off the "unprecedented attack" on devolution from the Tories at Westminster, a leading MEP said.

Alyn Smith called on activists to "put the badges to one side" and work with other parties, as well as civic Scotland and the trade unions in a "united front against this assault".

The Scottish Government and the Labour-led Welsh Government have worked together to produce a list of amendments to the European Union (Withdrawal) Bill that they say must be passed before the devolved administrations will approve the legislation.

And Smith said while SNP activists could have "all sorts of sport" about Labour's leadership contest in Scotland, they should be careful what they say about their political rivals.

The MEP, speaking at a fringe event at the SNP conference in Glasgow, stressed: "Much as there's all sorts of sport we can be having about the Labour leadership battle, such as it is, let's not because there's a lot of decent people in the Labour Party that we need to be on the same side as just now."

He told the audience: "Remember in your discussions with Labour people, people who used to be Labour, this is Donald Dewar's devolution settlement being ripped up. It was quite clearly designed that unless a power is specifically reserved to Westminster it is devolved."

Smith continued: "We need to circle the wagons on this, we need to work with the Labour Party. This is too important, the devolution settlement, the powers of our national parliament are under an unprecedented attack by people who are using the Brexit pretext to redesign the constitutional settlement of the UK.

"We need to be on our toes with this, and we need to put the badges to one side to an extent. We need civic Scotland, we need the unions, we need the other political parties joining the coaltion on this. We're all going to need to show Scotland's united front against this assault."

Meanwhile, Kirsty Hughes, director of the Scottish Centre on European Relations, said there was "not enough political challenge" to ministers over Brexit.

She said: "You've got an opposition Labour Party that has a completely vague position. It looks like Keir Starmer is trying to push them towards a softer Brexit that Jeremy Corbyn is resisting.

"To me, that seems to come out as not enough political challenge. I mean look at the state of our government, I don't think our government is remotely capable of even negotiating a bad deal."