Britain’s plan to leave the European Union (EU) has been complicated by a lack of accord between key negotiators.

Time is running out to prevent Brexit happening without an agreement in place on future relations. Economists warn that exiting without a deal will impact the entire global economy, yet British politicians continue to fight among themselves about what form Brexit should take. The EU’s main leaders also appear to be divided about what type of arrangement they would facilitate, with some showing sympathy and others drawing a harder line by ruling out any compromises.

Here’s a list of the key players influencing the talks at this crunch phase:

Theresa May

Theresa May.

The British prime minister was humiliated at the beginning of the year when her Withdrawal Agreement, put together after months of tense negotiations with the EU, was rejected in parliament by 230 votes, the greatest defeat of a sitting government in the U.K.'s democratic history.

May, previously a "Remainer," went on to survive a vote of no confidence and now faces a difficult task to put a more palatable deal on the table before Britain leaves the EU March 29. Her peers want substantial changes, especially when it comes to the contentious Irish backstop issue, but EU leaders say they won’t budge any further.

She has said a second referendum would do "irreparable damage to the integrity of our politics."

Stephen Barclay

Stephen Barclay.

May’s efforts to ensure a smooth exit have been impacted by Brexit ministers criticizing her negotiating skills. In November 2018, Barclay, a former banking executive at Barclays Plc, was appointed the third Brexit secretary in just six months after David Davis and Dominic Raab both quit the role.

Barclay has been loyal to May, backing her Withdrawal Agreement and claiming that it still remains the most popular option in parliament, even though it was defeated. To get MPs on board, he warned that further rejections of May’s proposals would lead to a no deal Brexit or no Brexit at all.

Jacob Rees-Mogg

Jacob Rees-Mogg.  UK Parliament

Not all members of the centre-right Conservative party are supportive of their elected leader. Rees-Mogg leads the European Research Group, an organization of Eurosceptics that contributed to the record defeat of May’s deal. He has consistently spoken out against her Brexit plans.

Rees-Mogg has refused to back alternative proposals from May, unless assurances are given that the EU's backstop proposal that Northern Ireland would stay in the single market and customs union will be removed. He also called for the prime minister to prevent a cross-party attempt to avoid a no deal Brexit from becoming law.

Jeremy Corbyn

Jeremy Corbyn.

Corbyn is leader of centre-left Labor, the country’s biggest opposition party. Although he has been critical of the EU in the past, Corbyn wants Britain to "remain and reform."

His main goal now is to prevent a Tory Brexit with May's deal. His party is putting forward its own soft Brexit deal for a vote and will support a second referendum if it is rejected. He has wanted May to rule out the chances of a no deal Brexit happening and to request an extension to Britain’s EU membership should no Brexit deal be agreed on by early March. Until she agrees to those requests, he’s made it clear that he won’t back her in any way.

Nine MPs quit the Labor party in February to form the Independent Group. They blamed Corbyn's failure to address anti-semitism in the party and present a coherent Brexit policy.

Yvette Cooper

Yvette Cooper.

Labor MP Yvette Cooper is seen as a possible successor to Corbyn and some have called her "the real leader of the opposition." The former cabinet minister has tabled an amendment with the Conservative party's Oliver Letwin that Labor is expected to back. The amendment rules out the possibility of Britain leaving the EU with no deal in place and gives parliament the chance to vote on whether the Article 50 process should be extended.

"I’m also fed up with the prime minister and her cabinet, who know we need to rule out no deal but are too weak to do so, and instead are standing back in the hope that parliament will do the job for them. That’s not leadership," she wrote in an op-ed.

Michel Barnier

Michel Barnier.

As the European Commission’s chief negotiator, Barnier has been given authority to negotiate for the bloc. The former French foreign minister has said the Irish backstop provision in the Withdrawal Agreement cannot be time-limited and will not be renegotiated.

He has warned that there is a high risk of Britain leaving without a deal and said delaying Brexit would require the approval of EU leaders.

Jean-Claude Juncker

Jean-Claude Juncker.

Juncker is president of the European Commission, which is the politically independent executive arm of the EU. He occasionally makes interventions, but mostly leaves Brexit to Barnier. Juncker

After May’s proposal was defeated, the former prime minister of Luxembourg said: “the risk of a disorderly withdrawal of the United Kingdom has increased." He has said the EU will not renegotiate the Withdrawal Agreement in response to May's demands and that extending the Article 50 negotiating period is something no one in Europe would oppose.

Donald Tusk

Donald Tusk.

Tusk is the president of the European Council and his job involves representing the heads of states or government collectively on foreign and security issues and setting the EU's general political direction and priorities with the Commission.

He has been campaigning for a future relationship that is "as close and special as possible," and has said that the U.K. should call off Brexit as the prime minister’s deal was rejected and “no-one wants no deal.” The former prime minister of Poland has said the "rational solution" in the current situation is delaying Brexit.

Guy Verhofstadt  

Guy Verhofstadt.

Verhofstadt is the Brexit coordinator for the elected European Parliament. He is responsible for representing its position during the negotiations and reporting back. Although the role of the European Parliament in Brexit negotiations is limited, it will vote on the Withdrawal Agreement with the Council.

Angela Merkel

Angela Merkel.

As chancellor of Europe’s largest economy, Germany, Merkel has some clout in Brexit negotiations. The leader of the centre-right Christian Democrat Union is big on European stability and views the U.K. as a key part of that.

At the World Economic Forum in Davos, Switzerland, she spoke about her concerns regarding a rise in nationalist thinking. Merkel doesn’t often talk about Brexit and when she does it’s usually to say how all parties must work on a deal to avoid a no deal scenario, even if that means compromising a bit. She said negotiators need to be creative to figure out how to maintain the integrity of the EU single market while avoiding placing any checkpoints along the Irish border.