In a statement, Reform chief whip Lee Anderson said it is over allegations around his business affairs published in a national newspaper.
The statement said at around 1pm: “I have today received a call from James McMurdock who has advised me, as Chief Whip, that he has removed the party whip from himself pending the outcome of an investigation into allegations that are likely to be published by a national newspaper.
“The allegations relate to business propriety during the pandemic and before he became an MP.
“At Reform UK we take these matters very seriously and James has agreed to cooperate in full with any investigation.
“We will not be commenting further at this moment.”
Mr McMurdock joined Reform UK in 2024 after having worked in the banking sector. In last year’s general election, he was elected as the MP for South Basildon and East Thurrock.
He beat Labour into second place, winning by 98 votes, taking the seat from the Conservatives.
It marks the latest incident of a Reform MP having the party whip removed – Rupert Lowe was suspended in March over alleged threats of physical violence towards the party’s then chairman Zia Yusuf.
The allegations were then referred to the Metropolitan Police, who later said Mr Lowe would not be charged.
The MP for Great Yarmouth has always denied wrongdoing and claimed he was the victim of a witch hunt after speaking out against party leader Nigel Farage in the media.
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