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Rishi Sunak is facing mounting questions about his judgment following reports that a minister he appointed to the cabinet last week is embroiled in allegations of misconduct.
Deputy Labor leader Angela Rayner called for an “urgent” investigation.
The allegations against cabinet minister Gavin Williamson were reported by media organization Tortoise.
Ms Rayner said: “These new revelations raise new questions about Rishi Sunak’s woeful judgment in resurrecting ministers who left the government under a cloud of misconduct.
“Gavin Williamson has been sacked from cabinet twice, yet, despite endangering national security, he has now been placed at the heart of corporate government headquarters.
“Given his new role and the seriousness of these allegations, there must be an urgent and independent investigation.
“Until he restores integrity, professionalism and accountability, Rishi Sunak is failing to stop the rot. He promised appointing an independent ethics adviser would be one of the first things he would do as Prime Minister, but instead he has given us more same old crap’.
Williamson quit Theresa May’s government amid allegations of a security breach. A Conservative Party spokesman said the party had “a robust complaints process in place”.
A friend of Williamson also told the Tortoise he “categorically denies these allegations” and is “very happy to share all communications with the former chief whip with CCHQ if required”.
Mr Williamson has been approached for comment.
A former chief whip himself, he played a key role in the Prime Minister’s leadership campaign this summer.
He became minister without portfolio after Mr Sunak took over the top job following the resignation of Ms Truss.
Mr Williamson’s return was widely seen as a remarkable political comeback. He has been fired twice by the cabinet.
Once when he was Defense Secretary under Mrs May and again by Boris Johnson when as Education Secretary he was blamed for the pandemic exams fiasco.
Mr Sunak is already facing questions over his decision to appoint Suella Braverman to his first cabinet.
He reappointed her to the position of interior minister just days after she resigned from the position for violating the ministerial code.
He was also roundly condemned after claiming the UK was facing an “invasion” of migrants on its south coast.
Charities accused her of dehumanizing language that would endanger public safety.
Ms Braverman made her comments just 24 hours after a bomb attack at an immigration center in Dover.
The embattled cabinet minister has also come under fire over the overcrowding crisis at an asylum center in Kent.
As the row over the choice of home secretary rages, Mr Sunak told the Commons earlier this week that they were “on the same page”.
But she refused to say whether she had been given legal warnings about blocking the transfer of asylum seekers from the center in Manston to hotels.
He was also forced to admit that “not enough” asylum claims have been processed, but insisted: “That’s what we’re going to fix.”
But he was warned by a leading poll expert that Ms Braverman’s reappointment could blow a hole in his hopes of staying in power in the general election.
Sir John Curtis said reinstating Ms Braverman after just six days in the post she lost for breaching the ministerial code represented a “danger”.