The decision of the majority of the British people to get their country out of the European Union, the EU, entered a new phase. A problem arose when most British parliamentarians did not heed the call of British Prime Minister Theresa May to support her agreement with the European Community. In a vote late on Tuesday in London, the majority of the British Parliament rejected the proposed agreement made by the government with the European Union. The refusal was carried out not only by opposition MPs, but also by government parties. Earlier Prime Minister Theresa May stated that the rejection of the agreements she made with the European Community would disappoint the British people. One point of the agreement between the British government and the European Union is that Britain will pay a “divorce bill” to the European Union around £27bn. In addition, the two parties agreed on the existence of a transition period that provides opportunities for both parties to avoid disruption to the business sector and trade. Indeed there will be no significant change with the agreement which scheduled to start on March 29, 2019 until December 31, 2020. Prime Minister Theresa May and her supporters are certainly thinking hard about the rejection by a majority of members of the British parliament. In addition to anticipating problems in the country, Theresa May also thought hard to convince the European Union of the implementation of the agreement. It is possible that the British Prime Minister will approach and attempt to make some adjustments. This is still possible because the agreement between the British Government and the European Union is political in nature. Domestically, criticism was raised over Brexit because members of Parliament considered Theresa May fail to fulfill hopes that Britain would regain full control of the bag of economic and trade policies held by the European Union. Another issue that is considered very crucial after Brexit is the regulation of borders in the Northern Ireland region. While it was still in the European Union, the border between the United Kingdom and northern Ireland is not physical. However, after exiting the European Union the border will become evident in the form of a control mechanism specifically to check the flow of goods. Prime Minister Theresa May must now make every effort to implement the results of the referendum two years ago. This is a test for her government because the impact of not agreeing to an agreement with the European Union is a threat of a vote of no confidence from Parliament.