THE European Parliament is to demand that last week's Brexit deal is converted into a legally binding text as soon as possible after David Davis was accused of undermining trust.

Guy Verhofstadt, its chief Brexit co-ordinator, said suggestions from the Brexit Secretary that the agreement was not binding had damaged MEPs’ trust in the UK.

On Sunday, Mr Davis appeared to suggest that the UK could seek to alter agreements on divorce issues including the Irish border, citizens' rights and the UK's £39 billion financial settlement, saying the deal was "much more a statement of intent than it was a legally enforceable thing".

After the Irish Government branded the comment "bizarre", the Secretary of State took to the airwaves once again yesterday, saying that Britain's commitment on the border issue was "much more than just legally enforceable".

Margaritis Schinas, the European Commission spokesman, later confirmed that the joint report published last week by Mr Davis and Michel Barnier, the EU Brexit negotiator, was "not legally binding" until it was incorporated in a formal Article 50 Withdrawal Agreement, expected in the autumn of 2018.

But asked if it was therefore possible for either side to back down on it, Mr Schinas stressed that it was regarded in Brussels as "a deal between gentlemen," which was "fully backed and endorsed" by the UK Government. He noted that Theresa May and Jean-Claude Juncker, the Commission President, had shaken hands on it.

Mr Verhofstadt suggested that MEPs would like to bring forward moves to make the agreement legally binding.

"Remarks by David Davis that Phase One deal last week not binding were unhelpful and undermine trust," he said in a tweet.

"European Parliament text will now reflect this and insist agreement translated into legal text ASAP."

The former Belgian premier said the UK must "stick to its commitments" and put them into a draft Withdrawal Agreement "as soon as possible" if there was to be progress in the second phase of negotiations on trade.

He has tabled two amendments for MEPs to consider in the European Parliament; one says Mr Davis's comments "risk to undermine the good faith that has been built during the negotiations" while the other calls on Britain to "fully respect" last week's Brexit deal and ensure it is "fully translated" into a draft Withdrawal Agreement.

Mr Verhofstadt explained that he had introduced the amendments alongside four other European Parliament groups, including the PPE group led by Manfred Weber, a close ally of German Chancellor Angela Merkel, as they are concerned about the "unacceptable description by David Davis of this agreement, saying it was merely a statement of intent, rather than a legally enforceable text".

In a Brussels press conference he went on: "And in our opinion that is really undermining the trust that is necessary in such negotiations.

"And the second amendment will therefore clearly indicate that before we can make progress in the second phase of the negotiations that that is absolutely necessary that the UK stick to its commitments and that these commitments are faithfully translated into the Withdrawal Agreement as fast as possible."

In response the Prime Minister’s spokesman said: "The Secretary of State set out yesterday - and the Commission agreed with him - that the agreement that was reached last week is a political agreement but that will move forward into a Withdrawal Agreement, which will be legally binding.

"The commitment is clear from the Prime Minister and the Secretary of State for Exiting the European Union that we don't want a hard border; everybody understands that," he added.