Labour's Deputy Leader Angela Rayner has asked ministers why they are refusing to release details of PPE contracts for a firm being investigated by the National Crime Agency.
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She said supplier PPE Medpro was reportedly raided by police, along with the home of Tory peer Baroness Mone - who she said was linked to the firm.
There were serious questions about due diligence, she told MPs.
Baroness Mone has previously denied any link to PPE Medpro.
Government efficiency minister Jacob Rees-Mogg said there was a global shortage of personal protective equipment in the pandemic and British manufacturers provided it in "unprecedented quantities".
But he declined to address the specifics of PPE Medpro's contracts or any alleged connections between Baroness Mone and the firm.
In January, the House of Lords launched an investigation into her "alleged involvement in procuring contracts for PPE Medpro" and whether it potentially breached the code of conduct.
Baroness Mone's lawyers have previously told the Guardian she had no association with the company or any involvement in the awarding of contracts.
PPE Medpro was awarded two contracts to supply protective equipment in May 2020 as part of the so-called "VIP lane", which allowed MPs, ministers and senior officials to pass on offers of help from suppliers, who could be awarded contracts without competing bids.