Boris Johnson says he has “seen no evidence” of blackmail in his party after claims by one of his own MPs.

William Wragg – who has called on the PM to resign over parties at No 10 – said suspected plotters have been threatened with bad publicity and cuts to constituency funding.

He has advised colleagues who feel threatened to go to the police.

An ex-Tory MP who defected to Labour, Christian Wakeford, also said he was threatened over funding for a school.

Mr Johnson told reporters: “I have seen no evidence [and] heard no evidence.”

Asked if he would look into the reports, he replied: “Of course.”

Labour’s deputy leader Angela Rayner called the claims “shocking” and Lib Dem leader Sir Ed Davey accused Mr Johnson of “acting more like a mafia boss than a prime minister”.

But Culture Secretary Nadine Dorries accused Mr Wragg of “attention-seeking behaviour”, calling his accusations “nonsense”.