Iain Duncan Smith has claimed that Home Secretary Theresa May has "refused" to ban the French far-right leader Marine Le Pen from visiting the UK to campaign for the EU referendum Leave campaign.
The former Work and Pensions Secretary voiced concerns that the Front National figurehead would "toxify" the debate if her UK visit went ahead and that she would only be joining the debate in the hope of stirring demands for an in/out referendum in France.
Speaking on ITV's The Agenda tonight he will accuse May of blocking requests to impose a ban.
He will say: "We've asked for her to be banned but the Home Secretary has refused to do it.
"She won't do it. I want her banned, I don't want her over because I think she will toxify the debate. She (Mrs May) can't ban her because of the European Union rules. She said she can't do it."
- Watch The Agenda with Tom Bradby on ITV at 10.35pm tonight.
Former Labour leader Ed Miliband has called for an end to the "secrecy and abuses" of tax havens.
Speaking on ITV's The Agenda with Tom Bradby, Mr Miliband called for sweeping changes to the UK's tax policy, including ending non-domiciled status, which allows some British citizens resident abroad to limit the tax they pay on foreign earnings.
"We go on about Panama - the top country in the world for tax avoidance is the UK," he said.
Mr Miliband also stood up for David Cameron, who has faced intense criticism over benefiting from his father's investment fund.
"I understand the prime minister defending his father and I understand it was upsetting for him," he said.
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Labour's Tristram Hunt will appear on the final episode of this series of The Agenda tonight.
Mr Hunt will speak to Tom Bradby about how Labour can recover following last week's general election defeat.
The shadow education secretary may also discuss his own leadership ambitions as speculation over Ed Miliband's potential successor continues.
TV presenter Nick Hewer will join the panel on ITV's The Agenda this evening.
The Apprentice and Countdown star will debate with Ukip's first elected MP Douglas Carswell, Oranges Are Not The Only Fruit novelist Jeanette Winterson and Sunday Times columnist Camilla Cavendish.
Political Editor Tom Bradby hosts the show, which airs on ITV at 10.40pm.
David Cameron spent yesterday telling voters and journalists just how pumped he is on the campaign trail.
Check out just how pumped Nick Clegg was on last night's Agenda with Tom Bradby.
Health Secretary Jeremy Hunt will appear on ITV's The Agenda tonight as the NHS continues to be at the forefront of election campaigning with just 14 days to go until the polls open.
Hunt will be speaking to Political Editor Tom Bradby during tonight's show, which airs on ITV at 10.40pm.
Author Anthony Horowitz, former Royal Opera House Creative Director Deborah Bull and columnist and broadcaster Jenni Russell will join Hunt on the show.
Chief Secretary to the Treasury Danny Alexander has said the Liberal Democrats were prevented from taking part in last night's challengers' debate on the BBC because of the Conservatives.
Speaking on ITV's The Agenda, after the debate programme, Mr Alexander insisted that his party wanted to be there "to defend our good record in government."
Mr Alexander added that Thursday night's TV debate showed that the Lib Dems were needed at Westminster to represent "the centre ground".
Other guests on The Agenda were poet Benjamin Zephaniah, journalist and broadcaster Julia Hartley-Brewer and BBC Radio4 presenter Aasmah Mir.