The UK and EU have agreed a draft document on their future relationship post-Brexit, the European Council president has announced.

Donald Tusk said the political declaration - covering areas like trade, security and fishing - had been agreed at negotiators' level and agreed in principle at political level.

The draft political declaration follows on from, and is separate to, the 585-page draft withdrawal agreement published last week which details the terms of the UK's divorce from the EU.

This fresh announcement clears the path for a special Brexit summit in Brussels on Sunday, where Theresa May will hope to gain the backing of the 27 remaining EU member states for both agreements.

The European Council president tweeted: "I have just sent to EU27 a draft Political Declaration on the Future Relationship between EU and UK.

"The Commission President has informed me that it has been agreed at negotiators' level and agreed in principle at political level, subject to the endorsement of the leaders."

It follows a meeting in Brussels on Wednesday evening between May and European Commission president Jean-Claude Juncker.

The Prime Minister will make a statement in the House of Commons on the political declaration later on Thursday afternoon.

On trade between the UK and EU post-Brexit, the declaration envisages both parties "having a trading relationship on goods that is as close as possible".

And on fishing, an area over which Scottish Conservative MPs have threatened to vote down May's Brexit deal if it does not protect fishermen's rights, the declaration calls for "a new fisheries agreement... on access to waters and quota shares".

The announcement comes after Scotland's farming union gave the Prime Minister's Brexit agreement its backing.

But Nicola Sturgeon and other opposition parties are preparing to oppose the deal when it comes before the House of Commons.

The First Minister wants full single market and customs union membership and told STV News on Tuesday that she is determined the Brexit deal does not leave Scotland "completely shafted".

The SNP has also said it would give its backing to a second EU referendum, or People's Vote, as an alternative to a bad Brexit deal.

Sturgeon described the political declaration as adding up to a "blindfold Brexit", with the document containing "lots of unicorns".

The First Minister tweeted: "Just read Political Declaration. Lots of unicorns taking the place of facts about the future relationship.

"Fair play to the EU for pushing it as far as possible...but it adds up to a blindfold Brexit. Difficult issues unresolved - so extended transition/backstop almost certain."

She added: "Looks to me like fishing will be a bargaining chip in wider trade negotiation...

"UKG was trying to get commitment to annual agreements on access - looks like they failed. Another Tory sell out of fishing on the cards.

"And if wider trade negotiation not agreed by July 2020, nor will fishing agreement."