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Boris Johnson. Photo: WIktor Szymanowicz/NurPhoto via Getty Images

British Prime Minister Boris Johnson said Sunday the United Kingdom will walk away from Brexit talks if no agreement is struck with the European Union by Oct. 15.

The big picture: The U.K. has five weeks to reach a deal with the EU, with negotiations due to resume in London on Tuesday. The threat comes as the U.K. plans legislation to "override" key aspects of the Brexit withdrawal agreement reached with the European Union — including on Northern Ireland, the Financial Times first reported Sunday.

Why it matters: The moves could see trade talks collapse and the unraveling of the deal the U.K. reached with the EU last October to avoid a hard border with customs control on the island of Ireland.

  • Michel Barnier, the EU's chief Brexit negotiator, said last week a "precise implementation of the withdrawal agreement" would be the "only way to avoid a hard border on the island of Ireland and preserve the all-island economy."

Between the lines: Northern Ireland has the U.K.'s only land border with an EU member state.

  • Top U.S. Democrats have ruled out a trade deal with the U.K. if Brexit creates a hard border with Ireland and violates the Good Friday Agreement — which helped bring peace to Northern Ireland in the 1990s after decades of sectarian violence. Congress must approve all U.S. trade deals.

Details: Aspects of the U.K. internal market bill, to be published Wednesday, are set to "eliminate the legal force of parts of the withdrawal agreement" signed in January — including on Northern Ireland customs, the FT notes.

  • A British government source told The Guardian the move was "part of the preparation for a no-deal exit" that would present "new trade barriers" from Northern Ireland.

What they're saying: A government spokesperson told the FT that officials were working to "resolve outstanding issues" on Northern Ireland. "[W]e are considering fallback options in the event this is not achieved to ensure the communities of Northern Ireland are protected," the spokesperson added.

  • Johnson said in a statement there's "no sense in thinking about timelines that go beyond" the Oct. 15 deadline.
  • "If we can't agree by then, then I do not see that there will be a free trade agreement between us, and we should both accept that and move on," he said. "Our door will never be closed and we will trade as friends and partners — but without a free trade agreement."

Go deeper: Brexit's Irish border headache

Go deeper

Biden's Day 1 challenges: The immigration reset

Illustration: Aïda Amer/Axios

President-elect Biden has an aggressive Day 1 immigration agenda that relies heavily on executive actions to undo President Trump's crackdown.

Why it matters: It's not that easy. Trump issued more than 400 executive actions on immigration. Advocates are fired up. The Supreme Court could threaten the Deferred Action for Childhood Arrivals (DACA) program, and experts warn there could be another surge at the border.

Trump doesn't need a border wall

Photo: Nicholas Kamm/AFP via Getty Images

President Trump has successfully built an immigration wall that has proven impenetrable for tens of thousands of migrants — it's just not the physical one he and others obsess about.

What's happening: The number of attempted border crossings is falling, and denial rates are climbing. The very nations most migrants flee from are now the nations where asylum seekers are being sent.

1 hour ago - Science

COVID time warp

Illustration: Sarah Grillo/Axios

The start of the COVID-19 pandemic seems like a lifetime ago to some, and just yesterday to others. Scientists are beginning to unpack the way people processed the passage of time amidst the stress, uncertainty and isolation of the 1 year, 8 months and 21 days since WHO declared a pandemic.

Why it matters: The pandemic's global effects on how people experience time could provide new insights into the brain's ability to perceive and predict time — a fundamental feature of life.