Nadine Dorries, a former aide of British Prime Minister Boris Johnson has lambasted the later saying the “history will not judge” current UK PM “kindly”.
Dorries, a former culture minister launched a scathing attack on Sunak, before submitting her resignation.
In her resignation letter, Dorries accused UK PM Sunak of abandoning "the fundamental principles of Conservatism" and said "history will not judge you kindly", reported AFP.
Dorries was unexpectedly not awarded a seat in the upper chamber of parliament, the House of Lords, in Johnson's resignation honours list.
Sunak rewarded fellow Brexit die-hards and even those implicated in the "Partygate" scandal that contributed to his downfall last year, the report mentioned.
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The omission prompted accusations from Johnson's camp of meddling from Sunak and Downing Street, it mentioned.
In her letter, which she released on social media, Dorries accused Sunak of leading attacks on her resulting in "the police having to visit my home and contact me on a number of occasions due to threats to my person, it stated.
"The clearly orchestrated and almost daily personal attacks demonstrates the pitifully low level your government has descended to," she wrote, the report mentioned.
She also attacked his record in Government, the report said.
"Since you took office a year ago, the country is run by a zombie parliament where nothing meaningful has happened," she wrote, it mentioned.
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"You have no mandate from the people and the Government is adrift," she was quoted as having said.
Meanwhile, Sunak's spokesperson has said that earlier it was "entirely untrue" that the prime minister or officials removed names from Johnson's list before it was sent to a House of Lords vetting committee, it mentioned.
The row in June over the honours prompted the resignation as MPs of both Nigel Adams, who was also omitted from the list, as well as Johnson himself.
At the same time Dorries announced her intention to resign.
Political observers have interpreted the resignations as Johnson's revenge on Sunak for forcing him out of office last July after "Partygate" and a string of other scandals, it said.
