Baroness Michelle Mone has accused the chancellor of using "dangerous and inflammatory" language after a firm linked to her and her husband was ordered to pay £122m for breaching a Covid-19 personal protective equipment (PPE) contract.
During a fringe event at Labour's party conference this week, Rachel Reeves reportedly joked the government had a vendetta against the peer.
In a letter to the prime minister, Baroness Mone said her language was "incendiary and has directly increased the risks to my personal safety". She claimed she received "threats and abuse" on social media since Reeves' remarks.
On Wednesday, a judge ruled that PPE Medpro's gowns did not comply with government standards.