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The investigation into Brexit money-man Arron Banks should be widened, says an MP.

The Leave.EU backer is alleged to have sought Russian support for his mining business in South Africa and Lesotho.

He is also embroiled in allegations that he sought military support for a Lesotho politician – all strongly denied by Mr Banks.

Labour’s Stephen Kinnock said yesterday: “The public deserves to know the source of £9million Mr Banks donated to Leave.EU, and what was discussed in meetings [he] held with senior Russian officials.”

The Electoral Commission is probing donations Mr Banks made before the 2016 EU referendum.

It comes as Brexit’s biggest bankroller Banks faces a National Crime Agency investigation over alleged links with Russia during the Brexit campaign.

The agency has reportedly been handed a cache of Banks’ emails, which reveal the Leave.EU chief was offered three Russian business deals during the Brexit campaign.

It’s sparked fresh concern Russia may have sought to influence the outcome of the EU Referendum .

Deals offered to Mr Banks included a gold mine venture in Guinea, West Africa and a stake in the privatisation of Alrosa, Russia’s state-controlled diamond mining firm, according to the Sunday Times.

Banks said he did not take part in any of the deals.

Of the National Crime Agency (NCA) investigation, Mr Banks said: “Let them investigate. All of this just makes me look like an international man of mystery.”