Keir Starmer addressed the state pension triple lock policy as he spoke about the increase to pension payments kicking in from next week.
The triple lock ensures a rise to the state pension each year of at least 2.5%, giving older people a level of security over their payments.
But there has been increased debate over the triple lock over the last few years and whether it can remain in its current form in future years.
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The Conservative leadership has made eyebrow-raising comments about the triple lock, raising questions about its long-term future.
Any decision to scrap it or change it would be hugely controversial.
The Prime Minister said Labour remained committed to the triple lock in the Commons this week as he spelled out pension increases from April 7.
He said during Prime Minister’s Questions: “We can commit to triple lock because we restored stability after they (the Conservatives) crashed the economy.
“Twelve million pensioners will receive up to £470 more.”
Starmer said it was the Conservatives who were putting the future of the triple lock under threat, as he raised previous comments by both Tory leader Kemi Badenoch and Shadow Chancellor Mel Stride.
The triple lock ensures the state pension increases every year in line with whatever is highest out of inflation, wage growth and 2.5%.
It is going up 4.1% this year to match wages.
There have been questions about whether the triple lock is too expensive and sustainable going into the future.
Starmer said: “The Shadow Chancellor called triple lock unsustainable and the leader of the opposition wants to means test the triple lock so she can cut it.”
Ms Badenoch was quick to point out the triple lock was “Conservative policy”, having been brought in under the Tories.
