Prime Minister Theresa May is off to Brussels to ask for a delay to Britain's departure from the European Union. EU leaders want to know she has a plan to break the U.K.'s political impasse, but talks between the British government and its political opponents over a compromise have yet to bear fruit. Meanwhile, Britain is scheduled to leave the EU in two days.

With Brexit once again engulfed in uncertainty, a look at what could happen next:

DELAY EXIT DAY

For two years, Britain was scheduled to leave the EU on March 29, 2019. But after Parliament three times rejected the divorce deal agreed between the U.K. government and the bloc, May admitted defeat and asked for more time.

Last month, the EU gave Britain until April 12 — this Friday — to pass a deal, come up with a new plan and seek a further extension, or leave without an agreement or a transition period to smooth the way.

Now May wants a bit more time. She has asked the EU to delay Brexit until June 30, in hope that'll be enough time to secure, approve and implement a deal.

The 27 other leaders of the bloc will consider the request at an emergency Brexit summit in Brussels Wednesday evening. Few favor the June 30 date. Some want a longer extension, to avoid repeated crises every few weeks.

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European Council President Donald Tusk has proposed a "flextension:" a delay of up to a year, but with flexibility to let Britain leave earlier if it approves an agreement.

But an extension is not guaranteed. EU countries are exasperated at Britain's interminable Brexit crisis. French President Emmanuel Macron, in particular, wants to impose conditions on any delay to ensure Britain cooperates with the bloc.

NO DEAL

As it stands, Britain is due to leave the EU on Friday — with or without a deal that would cushion the country's departure.

Most politicians, economists and business groups think leaving the world's largest trading bloc without an agreement would be damaging for the EU and disastrous for the U.K. It could lead to tariffs imposed on trade between Britain and the EU and customs checks that could cause gridlock at ports and shortages of essential goods.

A hardcore of pro-Brexit lawmakers in May's Conservative Party dismiss such warnings as fear-mongering. But most are opposed to leaving without a deal. Parliament has voted repeatedly to rule out a "no-deal" Brexit, and even passed a law that forces the government to ask for a delay to Britain's exit rather than crash out.

But a no-deal Brexit is still the legal default position, and could happen if the EU refuses to grant another extension. If that happens the only way to stop Britain crashing out would be for the government to choose the "nuclear option" and revoke the decision to leave.

CROSS-PARTY COMPROMISE

To secure a new Brexit delay, May must convince EU leaders that she has a plan to break the deadlock that grips Britain's political process almost three years after the country voted to leave the EU.

After failing to push through her Brexit deal with support from Conservatives alone, May last week began seeking a compromise with her Labour opponents.

Labour favors a softer Brexit than the government has proposed and is seeking a close economic relationship with the bloc through a customs union. That's anathema to many in May's Conservative Party, who say it would not leave Britain free to strike its own trade deals around the world.

Several days of talks have failed to produce a breakthrough, with Labour leader Jeremy Corbyn saying the government had not shifted from its negotiating "red lines." Still, negotiations between senior politicians from the two sides are set to continue Thursday.

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If they fail, May says she will let Parliament vote on a variety of options, including the government's proposed deal, in hope something can command a majority.

If Britain's politicians reach agreement around a so-called "soft Brexit," it could quite likely get through Parliament, and would be welcomed by the EU, allowing Britain an orderly departure in the coming months.

But it could also blast open rifts within both Conservatives and Labour. Pro-Brexit government ministers could resign, and pressure would grow on May to quit. The prime minister has already said she will resign if her Brexit deal is passed and Britain leaves the EU, and rivals are already circling, eager to succeed her.

Corbyn, meanwhile, would face rebellion from a large number of Labour lawmakers who want a new referendum on Britain's EU exit.

That instability increases the chance of an early British election, which could rearrange Parliament and break the deadlock — or result in still more stalemate.

NO BREXIT

Among pro-EU Britons, there is rising hope that Brexit can be stopped.

With one Brexit day gone and another likely to follow, the government has lost control of the timetable.

This week the government started preparing to take part in elections for the European Parliament in late May — acknowledgement that Britain likely won't have left the bloc by then, and may not leave anytime soon.

Support is growing for the idea that any Brexit deal agreed by Parliament should be put to public vote in a "confirmatory referendum," with the other option being to stay in the EU. The proposal is backed by Labour and other opposition parties, plus some of May's Conservatives.

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The government has ruled out holding another referendum, saying voters in 2016 made their decision to leave. But with divisions in both Parliament and in May's Cabinet, handing the decision back to the people in a new plebiscite could be seen as the only way forward.