Westminster has been rocked by a seismic rift at the heart of Keir Starmer’s government, just seven months after Labour’s election victory.
In a dramatic showdown, tensions between Downing Street and the Treasury have erupted into open warfare over defence spending — with the Prime Minister and Chancellor Rachel Reeves on a collision course.
At the centre of the storm is Starmer’s push to increase defence spending to 2.5% of GDP — a hike from the current 2.3%. But Reeves is digging in her heels, warning that the move could blow a hole in her carefully guarded fiscal rules. With her first major spending review looming, the Chancellor is refusing to back down, setting up a bitter battle with Number 10.
Sources say the Prime Minister is ready to overrule his Chancellor if necessary. “In the end, it’s the prime minister’s decision on national security,” a senior ally of Starmer told The Sunday Times. “We know we have to set out when we’re getting to 2.5%. The defence and security review will still do what we needed to do.”
The timing of the clash is explosive, coming before Starmer’s high-stakes visit to Washington for crunch talks with U.S. President Donald Trump. According to reports, a major announcement could come as soon as Monday, with Starmer facing intense pressure from the White House to show that Europe is willing to shoulder a greater share of the security burden.
In a pointed intervention, Business and Trade Secretary Jonathan Reynolds appeared to side with the Prime Minister, telling Sky News: “(She) knows more than most people the pressures on public services across the board, but defence has to be the cornerstone of our national prosperity as well as our security.”
But Reeves remains defiant, reportedly warning colleagues that a spending spree on defence could come at the expense of Labour’s promises to boost public services and drive economic growth. “It’s a false choice to suggest we can have guns without butter,” an ally of the Chancellor is quoted as saying.
The row comes amid growing unease within the Labour ranks over Starmer’s handling of foreign policy, with some cabinet ministers privately fearing the Prime Minister is aligning too closely with Trump’s hardline stance.
On Saturday, Starmer himself underlined the stakes, warning that the West must remain united against external threats. “The UK would work to ensure the U.S. and Europe remained together and that they should not allow divisions to distract them from ‘external enemies,’” he declared.
Former Conservative Prime Minister Boris Johnson has thrown his weight behind Starmer’s push to bolster defence spending and stand firm with the U.S.
On Ukraine, Boris was emphatic saying:
“The United States under Donald Trump is committed to a sovereign Ukraine. That is what Pete Hegseth has explicitly confirmed at NATO in the last few days.
“A sovereign country cannot be constrained in choosing which organisations it wishes to join. Ukraine is entirely sensible in wanting to join NATO. That process is a matter for Ukraine and NATO. It is absolutely nothing to do with Putin or Russia.
“I am afraid that attempts to negotiate on this point with Vladimir Putin are completely wrong in principle. They are also doomed. Putin’s demands will prove impossible to satisfy. Washington wants a sovereign Ukraine. Putin wants a vassal state. This is binary.
“It is time for the world to recognise the reality – that Ukraine has chosen to be a free country independent of Moscow. It is time for the Europeans – with Britain in the lead – to get serious, listen to what Trump is saying, and step up our military support for Ukraine.”
With Washington watching closely, Starmer’s showdown with Reeves is fast becoming a defining test of his premiership. Will he crush the rebellion within his own cabinet — or will the Chancellor’s warnings force him into retreat?
One thing is certain: With the battle lines drawn and the world stage set, Keir Starmer’s leadership is facing its most brutal test yet.
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