The UK has no legal power to unilaterally set aside the Brexit Withdrawal Agreement signed by Boris Johnson, European Commission president Ursula von der Leyen has warned in her State of Union #SOTEU speech on September 16. In the traditional annual address of the president of the European Commission to the European Parliament. The president said both sides had agreed it was the only way to guarantee the Northern Ireland peace process. In her speech she insisted that the trust would be undermined if the UK started reverse its international Treaty obligations.
Ursula von der Leyen addressed issue of the Withdrawal Agreement, which was concluded as a direct result of Brexit.

“We need new beginnings with old friends – on both of sides of the Atlantic and on both sides of the Channel. The scenes in this very room when we held hands and said goodbye with Auld Lang Syne spoke a thousand words. They showed an affection for the British people that will never fade. But with every day that passes the chances of a timely agreement do start to fade. Negotiations are always difficult. We are used to that.
And the Commission has the best and most experienced negotiator, Michel Barnier, to navigate us through.
But talks have not progressed as we would have wished. And that leaves us very little time.

“As ever, this House will be the first to know and will have the last say. And I can assure you we will continue to update you throughout, just as we did with the Withdrawal Agreement.That agreement took three years to negotiate and we worked relentlessly on it. Line by line, word by word. And together we succeeded. The result guarantees our citizens’ rights, financial interests, the integrity of the Single Market – and crucially the Good Friday Agreement.

“The EU and the UK jointly agreed it was the best and only way for ensuring peace on the island of Ireland.
And we will never backtrack on that. This agreement has been ratified by this House and the House of Commons.
It cannot be unilaterally changed, disregarded or dis-applied. This a matter of law, trust and good faith.
And that is not just me saying it – I remind you of the words of Margaret Thatcher: “Britain does not break Treaties. It would be bad for Britain, bad for relations with the rest of the world, and bad for any future Treaty on trade”. This was true then, and it is true today.
Trust is the foundation of any strong partnership” von der Leyen said.

Boris Johnson has urged MPs to support a bill which modifies the Brexit deal he signed with the EU in January. While the British Prime Minister said the Internal Markets Bill would “ensure the integrity of the UK internal market” and hand power to Scotland and Wales, and it would protect the Northern Ireland peace process. Critics insist that the move will damage the UK’s international standing after a minister admitted the plans break international law.