Nigel Farage is being docked half his monthly MEP salary after a European parliament investigation alleged he had misspent public funds intended for staffing his office.
Auditors were investigating the role of Christopher Adams, a man who was hired by Mr Farage to work as his assistant in the European Parliament.
The allegations centred around claims that EU-funded parliamentary assistants were actually working for the national party and doing work unrelated to the duties of MEPs.
A source in the European parliament told the Guardian: "Since 1 January  the European parliament has withheld 50% in order to recoup the €40,000 due in salary that was paid to Christopher Adams and which can not be proved by Farage".
The British daily The Guardian reported on Friday that auditors found that Farage a year ago had used his parliamentary allowances to pay an assistant who was actually working for his party in Britain instead of doing parliamentary work in Strasbourg.
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Two investigations were closed without any formal action.
Mr Helmer denied any wrongdoing but gave no explanation as to why he was stepping down. They dismissed the salary cut as a "politically-motivated assault". Part-time assistants need to have second jobs, paid and voluntary, vetted by European parliament authorities to prevent a conflict of interest. He is ranked 748 out of 751 MEPs and has taken part in only 37% of votes in the current parliamentary session, according to VoteWatch Europe.
Mr Campbell defended his political view, telling the TalkRADIO host that British voters are "entitled to change their minds" on whether to leave the European Union as details of the effects of Brexit emerge.
The revelations came after Mr Farage was blasted by top Brexiteers, including those within his own party, over his remarks on a second referendum.
The Brexit campaigner now has to pay back £35,500 after financial investigators ruled that European Parliament funds money had been misapplied.