Within the following 48 hours, the European Commission is expected to issue "draft negotiation guidelines", which will be sent to the 27 remaining states for consultation. EU wants transition periods to be in line with European law and strictly limited in time.
Talks are expected to begin with the bill that European Union members want to impose on Britain for leaving, the status of European Union nationals in Britain and vice versa, and the border in Northern Ireland, before moving on to a future deal.Britain must negotiate the terms of its departure and a future trade deal by a deadline of March 2019.
"Our watchword will be 'Citizens First, '" Barnier assured committee members.Residency rights, access to the labor market and education, and pension and social security programs would need to be settled.Barnier said that the United Kingdom would need to pay its share for any program negotiated while the United Kingdom was part of the EU."Let me be clear", said Barnier.
Abe, in Brussels for talks on a possible EU-Japan trade deal, urged both sides in the Brexit talks to make the process as smooth as possible.
"It will take time, several months certainly".
Barnier also called for a continued framework for EU-UK cooperation on security and defence, and reaffirmed that unity among the EU27 would be the primary condition of any deal.
Theresa May pledged to "bring an end to the jurisdiction of the European Court of Justice" in her speech setting out her priorities for Brexit.
"We will be particularly attentive, in these negotiations, to the consequences of the UK's decision to leave the Customs Union, and to anything that may, in one way or another, weaken dialogue and peace", Barnier said.
May has promised a parliamentary vote on the withdrawal deal, but is offering MPs only the option to "take it or leave it".
A total of 71 per cent of voters want mobile phone companies to stick to European Union rules that limit the cost of calls overseas, while 68 per cent hope to see British airlines following European Union rules on compensating passengers who have experienced delays.
Mrs May told ministers the invoking of Article 50 on March 29 would be a "historic event" which will see Britain begin a "bold new chapter as a prosperous, open and global nation", her official spokesman said.
This date can be extended for further negotiations by agreement between all member states.
Mrs May is due to visit all four nations of the United Kingdom before triggering Article 50.
"The sooner we reach a deal on an orderly withdrawal, the sooner we can prepare for the future relationship", he said today.
Even if a trade agreement has been sealed, the Government has made clear that it could be introduced gradually during an "implementation phase" after Brexit.