The PM has backed down following a rebellion by Labour MPs over plans to limit the release of files relating to Peter Mandelson's appointment as UK ambassador to the US.
Previously, ministers had insisted that information relating to national security or international relations would not be published.
But following outspoken interventions from senior Labour MPs Angela Rayner and Dame Meg Hillier, the government has now backed down.
It has altered its amendment, to say that any papers which are prejudicial to national security or international relations will be referred to parliament's Intelligence and Security Committee (ISC).
This is what Rayner and Hillier, among others, have called for.
The Tories previously warned the government's original amendment would amount to ministers "marking their own homework" - having free rein to decide what could be made public.
Our chief political correspondent Jon Craig says this change has led to "a lot of frenzied activity" in parliament in the last few minutes, with Sir Jeremy Wright - deputy chair of the ISC - seen "deep in conversation" with the leader of the Commons, Sir Alan Campbell.
Watch Jon breaking that news here:
Jon also notes that Wright came back from the Lords, where he believes he was discussing the changes with Lord Beamish, chair of the ISC.
"So, the government, desperate to avoid a rebellion by many of its MPs, furious at the behaviour of Peter Mandelson, is desperately trying to avoid a split," Jon concludes.
Starmer appointed Mandelson as the UK's ambassador to the US in February last year.
However, he sacked him in September after new emails revealed Mandelson sent messages of support to Epstein even as the paedophile financier faced jail for sex offences in 2008.
The scandal reignited this week after more emails between Mandelson and Epstein were revealed as part of a tranche of new Epstein documents released by the US Justice Department.
Scroll down to read more about this story, including:
- Starmer saying Mandelson 'lied repeatedly' to his team before being made ambassador;
- Beth Rigby and Sam Coates have their say on the Mandelson scandal;
- And more from Prime Minister's Questions - including Kemi Badenoch's criticism of Starmer.