Former Conservative Party chair Baroness Warsi has jumped ship from the Leave campaign to Remain just days before the EU referendum.

A spokesperson for Leave lashed out, telling City A.M.: "Was she for Leave? We didn't realise."

Warsi accused leading Leave campaigner and justice secretary Michael Gove of peddling "complete lies", while attacking Ukip's "breaking point" poster which depicts hundreds of refugees trudging across Europe.

Read more: FTSE 100 bosses will this week issue a last minute rallying cry for the Remain campaign

She told The Times newspaper: "That ‘breaking point’ poster really was – for me – the breaking point to say ‘I can’t go on supporting this’. Are we prepared to tell lies, to spread hate and xenophobia just to win a campaign? For me that’s a step too far."

The "breaking point" poster came under fire from both sides of the EU referendum campaign today.

Read more: Cameron's Remain pleas met with hostility from TV audience

Prime Minister David Cameron told an audience on BBC Question Time this evening that "there have been some moments like the Nigel Farage poster which I think are just wrong … it's an attempt to frighten people, to scare them to divide people."

His comments came after Gove told the Andrew Marr show that: "When I saw that poster, I shuddered. I thought it was the wrong thing to do."

Chancellor George Osborne previously compared the poster to Nazi propaganda.