The most dangerous opponents in politics are often not the loudest.
They are the figures who acquire authority before they acquire ambition. The people whose criticism carries weight because they are not habitual rebels, factional plotters or serial malcontents.
That is what makes Al Carns such a problem for Sir Keir Starmer.
When the former Royal Marines colonel dramatically quit the Government on Thursday evening, his resignation was immediately interpreted as a row over defence spending. It was that, certainly. But his latest remarks suggest something much bigger was brewing beneath the surface.
Speaking after his resignation, Carns revealed he had considered quitting “for a long time” and had come close to walking out on multiple occasions; the reasons are telling.
One was the Northern Ireland Legacy Act, where he believes the Government risks creating what he described as a “hierarchy of truth. The other was his exclusion from crucial Defence Investment Plan discussions despite spending 24 years in uniform and serving multiple tours in Afghanistan. The frustration is palpable.
Here was the Armed Forces minister, a man who had experienced modern warfare first-hand, watching from the sidelines as decisions were made about Britain’s military future. “I know what the Armed Forces need,” he said. The implication was clear. The Government either did not want to hear it or did not value the advice.
For any administration, that would be an uncomfortable accusation. For one facing mounting criticism over defence preparedness, it is politically explosive. Carns’ resignation letter landed like a mortar round in Westminster. It was not written by an ambitious backbencher seeking attention. Nor was it the work of an ideological opponent.
Instead, it was a devastating critique from a serving minister who claimed to have seen the intelligence, spoken to commanders and concluded Britain’s defence plans were inadequate. We are asking our Armed Forces to operate in a more dangerous world on a budget written for a calmer one,” he wrote. That single sentence encapsulates a growing anxiety running through military circles.
Russia continues to rearm. European governments are scrambling to boost defence spending. Nato leaders openly discuss the possibility of future confrontation with Moscow. Yet Britain remains locked in arguments about affordability. Carns’ warning was not merely that Britain was spending too little. It was that ministers understood the risks and were choosing to proceed anyway.
That distinction matters. Governments can survive accusations of incompetence. Accusations of knowingly underfunding national security are considerably harder to shake. What makes the situation even more intriguing is Carns’ political positioning. Unlike many disgruntled former ministers, he did not launch a full-scale assault on the Prime Minister. Quite the opposite.
He insisted Starmer should remain in office and spoke warmly of newly appointed Defence Secretary Dan Jarvis. But then came the answer that Westminster will dissect for days. Asked whether he would stand in a future leadership contest, Carns declined to rule it out. Instead he reached for a phrase from his military career. “Always run to the sound of gunfire.” In military terms, it means moving towards the crisis rather than away from it.
In political terms, it sounded remarkably like a man keeping his options open. No serious observer believes a leadership challenge is imminent. Starmer remains firmly in Downing Street and commands a substantial parliamentary majority. But politics is littered with figures who initially insisted they had no leadership ambitions before circumstances changed.
Carns possesses attributes increasingly rare in modern politics: military credibility, ministerial experience and an image of public service that extends beyond Westminster tribalism. That explains why he is already being discussed as a potential “dark horse” should Labour’s internal tensions deepen. For now, his rebellion is primarily about defence. Yet his resignation has exposed something potentially more damaging for Downing Street.
It has revealed a growing disconnect between ministers responsible for Britain’s security and those controlling the purse strings. At a time when the Government insists the international situation is becoming more dangerous, one of its most respected military voices has walked away claiming Britain is not taking the threat seriously enough. That is not a disagreement that disappears with a reshuffle. It is the sort of warning that lingers. And in Westminster, the warnings that linger are often the ones that eventually return to haunt prime ministers.
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