Those were, he said, the rights of expatriate citizens and problems of a new EU-UK border, notably cutting across Ireland.
The UK's plan was to be in a position where they could secure a trade deal with the European Union while discussing their "divorce settlement".
"Michel and I will meet every four weeks bringing our teams together for a number of days at a time".
"There is a long way to go, but we are off to a promising start".
The commencement of Brexit negotiations this week is good news for the United Kingdom and the EU.
In their June 2016 referendum, the majority of the British citizens voted in favor of Brexit (51.9% to 48.1%).
He said Prime Minister Theresa May will later this week update European leaders on Britain's approach on protecting citizen rights at the EU summit slated for Thursday and Friday. David Davis and I, as chief European Union negotiator, will discuss the issues together, tackle difficulties, and lift obstacles.
The issue of citizens' rights is one of three priorities in the Brexit talks which began on Monday, along with Britain's estimated 100 billion euro (88 billion pounds, $112 billion) divorce bill, and the fraught question of Northern Ireland, which will share Britain's only land border with the European Union after Brexit.
European Union chief negotiator Michel Barnier said the talks with Brexit minister David Davis, which are starting a full year after Britain's seismic vote to leave, had started "on the right foot".
The Brexit secretary David Davis had previously rejected this and predicted that it would be the "row of the summer" once negotiations began. They tried to present a cordial and friendly image to the world at their first session.
"We are citizens first".
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Doctors last week said Warmbier had suffered severe neurological injuries, for which tests did not conclusively reveal the cause. He was sentenced in March 2016 to 15 years in prison with hard labor.
The 15 per cent post-Brexit drop in the pound has pushed up inflation as it makes imports, such as food and energy, more expensive, causing living standards to fall as wage increases fail to keep up pace.
"While this will be a Government that consults and listens, we are clear that we are going to see Brexit through, working with Parliament, business, the devolved administrations and others to ensure a smooth and orderly withdrawal", she said.
The discussions set to take place this month will mostly focus on three major aspects - citizens' rights, financials and other issues related to the separation process.
"For me the shaping of the future of the 27 is a priority coming before the issue of the negotiations with Britain on the exit", Merkel said.
A dialogue about Ireland and Northern Ireland has been launched separately. And we will leave the EU.
A detailed paper will then be published on Monday, Mr Davis confirmed.
Discussions aimed at preserving the Good Friday Agreement and common travel area in Ireland will begin, although Davis suggested these issues may not be settled until the end of the process, when the UK's trade relationship with the European Union is settled, the BBC reported.
Mr Davis insisted the agreement of the timetable did not show the United Kingdom was in a weak negotiating position.
"It's not when it starts it's how it finishes that matters", he said.
May officially triggered the two-year Brexit process in March when she was riding high in opinion polls, and called for fresh elections shortly afterwards to shore up her mandate for a tough Brexit stance.
"Therefore, during the upcoming European Council, I want us to move further on our policy response in these three areas", Tusk said in the letter to the leaders. This uncompromising stance is "not about punishment" or "revenge", but simply a effect of the U.K.'s decision to exit, he said. "That is what I said to David today", he said, adding that there would be "no hostility on my side".
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