The Metropolitan Police said in a statement on Saturday that it "has received two allegations of electoral fraud and malpractice" relating to the December 12 snap election.
Banks told Reuters that he thinks Farage will also stand down candidates in Labour marginals to avoid splitting the Brexit vote.
Nigel Farage said his Brexit Party won't contest seats held by Boris Johnson's Conservatives in order to prevent a hung or pro-Remain parliament.
The leader of the Brexit Party sparked criticism at the opening of the EU Parliament, where he and his 28 fellow MEPs turned their backs as the EU's unofficial anthem — Beethoven's Ode to Joy — was played.
The opposition Labour party narrowly retained its Peterborough seat in eastern England, denying the Brexit party its first seat in the UK parliament.