Robert Jenrick has accused David Lammy of allowing a "loophole" system that allows violent prisoners to play video games and eat sweets.
The Shadow Justice Secretary pointed to Southport killer Axel Rudakubana, who he said officers were "forced" to bring treats such as Haribo sweets and Diet Coke.
Mr Jenrick pointed to the "prison incentives framework", which rewards prisoners who behave well with perks.
He said: "That's fine, but it shouldn't apply to murderers, rapists and violent criminals. But there is a massive loophole, if you attack a prison officer, you're meant to be deprived of all your perks.
"But if you claim you're at risk of self harm, you can and do often get them right back."
Mr Jenrick called on his Government equivalent David Lammy to change the rules "today."
GB News has approached the Ministry of Justice for a comment.
FOLLOW BELOW FOR LIVE UPDATES THROUGHOUT THE DAY…
Reform UK opens narrow lead over Plaid Cymru in key Welsh by-election
Reform UK has opened a narrow lead over Plaid Cymru in a crunch by election for the Welsh Senedd.
The poll, commissioned by Camlas Public Affairs and conducted by Survation, places Reform on 42 per cent of the vote in Caerphilly with Plaid just behind on 38 per cent.
Labour trails on 12 per cent in a dramatic collapse in a region where Sir Keir Starmer's party has dominated.
WATCH: Stephen Kinnock on the state of the UK's economy as Rachel Reeves arrives in Washington for summit
China 'stole' classified state secrets and it was 'covered up', says Dominic Cummings
Dominic Cummings has claimed that China breached high level systems to obtain "vast amounts" of classified government information for years.
Boris Johnson’s former adviser said he and the then-Prime Minister were told about the breach in 2020 and that it involved so-called Strap material, a government classification for highly sensitive intelligence material.
He said that fundamental infrastructure for transferring sensitive data around the British state was compromised "for years."
Mr Cummings did not say how the system had been breached but that he would be willing to share what he knew with MPs if they were to hold an inquiry.
He told The Times: "What I’m saying is that some Strap stuff was compromised and vast amounts of data classified as extremely secret and extremely dangerous for any foreign entity to control was compromised.
"Material from intelligence services. Material from the National Security Secretariat in the Cabinet Office. Things the government has to keep secret. If they’re not secret, then there are very, very serious implications for it."
A Cabinet Office spokesman said: "It is untrue to claim that the systems we use to transfer the most sensitive government information have been compromised."
One former Whitehall official told The Telegraph Mr Cummings’s characterisation of what happened was "utter nonsense" but agreed that security breaches had occurred.
Urgent question granted on China spy witness statements
The Commons has confirmed the Conservatives have successfully tabled an urgent question on the China spy case at 10.30am.
Conservative MP and shadow minister Neil O’Brien has tabled the question, asking for a statement "on the three witness statements in relation to alleged breach of Official Secrets Act on behalf of China."
A minister will respond in the Commons.
WATCH: Mel Stride argues that the Chancellor will blame absolutely everybody except herself for her Budget
Labour minister 'disappointed' China prosecutions didn't go ahead
A Labour minister has said he is "disappointed" prosecutions into the China case did not go ahead.
Minister for Care, Stephen Kinnock was asked by GB News about whether meeting minutes and official documents would be published .
He told GB News: "There are Government processes around this, we have to be very careful about info that gets released as it may compromise national security."
WATCH: Charlie Rowley gives his view on reports that Rachel Reeves will raise taxes in her upcoming Budget
Mel Stride says China has been getting hold of secrets 'for quite some time'
Sir Mel Stride said the Government was entirely negligent
|GB NEWS
Sir Mel Stride has suggested China has been getting hold of British secrets 'for quite some time' when pressed on comments made by Dominic Cummings.
The Shadow Chancellor told GB News: "I think with the Cummings comments there seems to be quite a bit of uncertainty as to what may or may not happen."
When told the reports were backed up by Tom Tugendhat, Sir Mel said: "I think Tom was speaking in general terms the idea that China has been getting hold of secrets of our country, which is of course something we know China has been up to for a very long time."
"What we know from information released was the Government was entirely negligent."
China espionage case: What you need to know
Yesterday, Sir Keir Starmer published a senior official's evidence in the prosecution of two men charged with spying for China.
The Government is looking to prove that the case did not collapse because of Government manipulation.
Last month, the Crown Prosecution Service (CPS) dropped charges against two British men who both deny passing politically sensitive information to a Chinese intelligence agent.
The CPS said the case was dropped because it needed evidence showing that the UK considered China a threat to national security, but the government had not provided it after months of requests.
While the newly published documents detailed Chinese malign activity, they did not unequivocally state that China posed a threat to UK national security.
Sir Keir had earlier said the fault lay with the previous Conservative administration which was in power when the men were charged and which had only described Beijing as an "epoch-defining challenge".
Rachel Reeves insists there 'won’t be a return to austerity'
Chancellor Rachel Reeves has insisted there "won't be a return to austerity" as the Autumn budget draws ever closer.
Ms Reeves is attending the annual meetings of the International Monetary Fund (IMF) in Washington today.
She told The Guardian: "In the budget next month, there won’t be a return to austerity. We know that we face a changing global environment in terms of the economy at the moment.
"But last year, I put investment in, to reduce waiting lists, to build housing, to build the energy infrastructure to get people’s bills down sustainably, not through quick fixes, and we’ll stick to that course."
Kelvin MacKenzie: Labour get 'applause' for echoing Reform UK
Home Secretary Shabana Mahmood has said the UK has lost control of its borders | PAKelvin MacKenzie has hit out at the "hypocrisy of this socialist shower" over comments about Britain's broken borders.
The former Editor of The Sun has said he is "beyond frustrated" with the current state of the country and Labour's approach to the border system.
UK economy GROWS in August in boost for Rachel Reeves with Britain 'finding its feet'
Britain's economy grew in the three months to August, following a zero growth month for July, the Office for National Statistics (ONS) has said.
This will come as a relief to Labour, as growth was central to their core manifesto pledges, an improvement on the economic data for July.
Figures saw a slight increase following growth of 0.1 per cent compared to the figures in July.