EU's Tusk, Britain's May meeting for Brexit talks in London

Prime Minister Theresa May speaks during a visit to Calverton Village Hall in Calverton, central England , Thursday April 6, 2017 where she launched the Conservative Party's local election campaign. Thursday April 6, 2017. (Chris Radburn/PA via AP) (The Associated Press)

Britain's Prime Minister Theresa May smiles as she greets Donald Tusk, President of the EU Council, on the doorstep of 10 Downing Street ahead of a meeting, in London, Thursday, April 6, 2017. (AP Photo/Frank Augstein) (The Associated Press)

Britain's Prime Minister Theresa May greets Donald Tusk, President of the EU Council, on the doorstep of 10 Downing Street ahead of a meeting, in London, Thursday, April 6, 2017. (AP Photo/Frank Augstein) (The Associated Press)

European Council President Donald Tusk is meeting Britain's leader for talks about the U.K.'s EU exit, a day after the European Parliament laid out tough guidelines for the divorce negotiations.

Tusk's office says he will meet Prime Minister Theresa May at 10 Downing St. on Thursday afternoon.

The talks come as both sides are settling on their negotiating positions. The European Parliament on Wednesday backed the bloc's chief negotiator in demanding Britain pay as much as 60 billion euros ($64 billion) for outstanding commitments.

EU lawmakers also called for phased negotiations, in which divorce terms are settled before a new trade deal is secured. Britain wants the two strands to go hand-in-hand.

May triggered a two-year countdown to Brexit last month by invoking Article 50 of the EU's key treaty.