In the context of political violence during the riots, the agreement forced participants to find «exclusively democratic and peaceful means to resolve political differences.» This required two aspects: these themes – parades, flags and legacy of the past – were negotiated in 2013 under the chairmanship of Richard N. Haass, president of the Council on Foreign Relations, and Meghan L. O`Sullivan, a professor at Harvard`s Kennedy School and now on the CFR board. The talks involving the five main political parties were not agreed upon, although many of these proposals – including the creation of a historic investigation unit to investigate unsolved deaths during the conflict and a commission to help victims obtain information about the deaths of their loved ones – were a large part of the Stormont House agreement reached in 2014. During negotiations on the UK`s planned withdrawal from the European Union in 2019, the EU presented a position paper on its concerns about Britain`s support for the Good Friday agreement during Brexit. The position paper deals with issues such as the prevention of a hard border, north-south cooperation between the Republic of Northern Ireland, the birthright of all Northern Ireland residents (as stated in the agreement) and the common travel area.   Anyone who was born in Northern Ireland and is therefore entitled to an Irish passport under the Good Friday Agreement may retain European citizenship after Brexit.  As part of the EU`s Brexit negotiating guidelines, the UK was asked to convince other EU members that these issues had been addressed in order to enter the second phase of the Brexit negotiations. In order to protect North-South cooperation and avoid controls at the Irish border, the United Kingdom, under the leadership of Prime Minister Theresa May, said it was ready to protect the agreement in all its parties and «in the absence of agreed solutions, the Uk would maintain full alignment with the rules of the internal market and customs union, which are now or in the future. , North-South cooperation supporting the island`s economy and protecting the 1998 agreement» by acknowledging that «it is the restriction that nothing is agreed until everything has been agreed».     This provision was part of an agreement between the United Kingdom and the EU, which was rejected three times by the British Parliament.
 May`s successor, Prime Minister Boris Johnson, initially cited the «Irish backstop» that was to be withdrawn from the proposed agreement, but finally accepted it after the negotiation of a new agreement between the UK and the EU on 17 October 2019.   In September 2020, Northern Ireland Secretary Brandon Lewis has informed the House of Commons that the UK government intends to violate international law in a «specific and limited» manner by introducing a new bill that gives the UK government new national powers to circumvent certain international contractual obligations to the EU, as provided for in the Northern Irish Protocol of the Brexit Withdrawal Agreement.  The bill introduced the following day sparked widespread outrage in the United Kingdom and internationally, with the Prime Ministers of Scotland and Wales calling the Conservative government`s proposals to try to take power and cancel decentralisation.   Most parties in Northern Ireland expressed concern about the law, although some members of the Democratic Unionist Party, who had always opposed the Good Friday agreement, welcomed the law.  Prime Minister Michel Martin said that «confidence» in the British government`s plan had eroded  The two main political parties in the agreement were the Ulster Unionist Party (UUP), led by David Trimble, and the Social Democratic and Labour Party (SDLP), led by John Hume.