He told the BBC: “We need to get more working class young people into the Civil Service so it harnesses the broadest range of talent and truly reflects the country.
“Government makes better decisions when it represents and understands the people we serve.”
Currently around a quarter of higher education students are from a lower socio-economic background, but the group represented only 12% of successful applicants to the Fast Stream in 2024.
Some Labour ministers have come to believe in their first year in office that parts of the civil service are too privileged, with people who have come from similar backgrounds.
A summer internship programme already exists. The programme is for undergraduates in their final two years of university, lasts six to eight weeks and is paid.
Under the changes, which will take effect for the summer of 2026, the intake will be restricted only to students from poorer backgrounds.
The programme will give them experience including planning events, writing briefings for ministers, shadowing senior civil servants and carrying out research for policy development.
Those deemed to have performed well will then be fast-tracked to the final stages of the Fast Stream selection process if they decide to apply to work in the civil service after graduation.
The government is also trying to establish more career paths into the senior ranks of the civil service outside of London, announcing earlier this year that by 2030 half of the placements on the Fast Stream will be located outside of the capital.
The Labour government has been strikingly critical of some of the practices of the civil service since coming to office in July last year. In December, Sir Keir Starmer said that “too many people in Whitehall are comfortable in the tepid bath of managed decline,” incurring criticism from civil service unions.
The prime minister has also said he wants to “rewire” the way the state works.