Former Defence Minister Al Carns said he will not rule out running for the Labour leadership following the resignation of Sir Keir Starmer.

The potential candidacy of Carns, the MP for Aberdeen, comes at a critical juncture for the party as it seeks a successor to lead the government. His entry into the race would signal a shift in the party's internal dynamics, particularly regarding national security and fiscal priorities.

During an appearance on BBC Newsnight, Carns was questioned about his ambitions to lead the party. He recently stepped down from his role as Armed Forces Minister following a dispute over defence spending. This resignation has fueled speculation that he is positioning himself as a viable alternative to other contenders, such as Andy Burnham.

Carns has already begun defining the requirements for the next leader. He established a set of five [1] tests that any contender for the top job must meet. He said the country's new leader should be able to 'say yes' to each point on his list [2].

While some view him as a dark horse in the contest, Carns indicated he is prepared to contest the leadership. He said, "I will not rule out challenging the favourite for top job" [3].

The former minister's focus on defence spending suggests that the next leadership battle may center on how the UK balances social investment, and military readiness. His willingness to challenge the front-runners indicates a fragmented field as the party moves to fill the vacancy left by Starmer.

I will not rule out challenging the favourite for top job.

The potential candidacy of Al Carns introduces a specific focus on defence and security into the Labour leadership race. By resigning over spending disputes and establishing a set of criteria for the next leader, Carns is attempting to frame the debate around national security—a move that could polarize the party between its more dovish and hawkish wings during the transition of power.