Sadiq Khan, David Cameron
Sadiq Khan was attacked by David Cameron  for a sharing a platform with an alleged Islamic State (Isis) "supporter" Reuters

David Cameron drew anger from Labour MPs as he used Prime Minister's Questions (PMQs) to attack Sadiq Khan for a sharing a platform with an alleged Islamic State (Isis) "supporter". Cameron claimed the Mayor of London hopeful and Sulaiman Ghani had spoken together at nine different events.

"If we are a going to condemn, not just violent extremism but also the extremism that seeks to justify violence in anyway, it is very important that we do not back these people and we do not appear on platforms with them," the Conservative leader declared.

"I have to say, I am concerned about Labour's candidate for Mayor of London who has appeared again and again and again...." The prime minister was then interrupted by a furious Jeremy Corbyn, who heckled Cameron.

"The leader of the Labour Party is saying this is disgraceful, let me tell him... Right, so – Sulaiman Ghani – the Honourable Member for Tooting has appeared on a platform with him nine times. This man supports Isis. Mr Speaker, they are shouting down this points because they don't want to hear the truth.

"Anyone can make a mistake about who they appear on a platform with, we are not always responsible for what our political opponents say, but if you do it time after time after time, it's right to question your judgement."

Khan, who worked as human rights lawyer before being elected to parliament, said he was "disappointed" by Cameron's attack. "The Tories are running a nasty, dog-whistling campaign that is designed to divide London's communities. I'm disappointed that the prime minister has today joined in," he declared.

"As Mayor, I will be the British Muslim who takes the fight to the extremists. I will keep focusing on keeping Londoners safe, and my positive vision for London's future – most importantly fixing the Tory housing crisis."

Tory City Hall candidate Zac Goldsmith has also questioned the Labour MP's judgement, describing Ghani as "one of the most repellent figures in this country". But the attack backfired when the Tooting Islamic Centre imam published a picture of himself and Goldsmith together.

Khan is ten points ahead of Goldsmith in the second round of voting, according to the latest poll from ComRes. The survey, of more than 1,000 people between 30 March and 3 April, put the Labour candidate on 55% and the Conservative hopeful on 45%.