Sadiq Khan's campaign to be London mayor was today dealt a blow when an aide was forced to quit in a row over offensive tweets.
Shueb Salar, who was described as a parliamentary assistant, posted abusive comments about women and gay men.
Khan's opponents claimed his decision to hire Salar raised questions about his judgement.
In one tweet posted in 2012, Salar said: 'Had the funniest tube journey ever! Some rowdy chavs were cussing these 2 gay guys for kissing LOL maybe they deserved it.'
In another he refers to "treating a lady" by "buying her a nice iron and extending the kitchen for her".
Labour's candidate faced further embarrassment when a video emerged of Salar with brandishing a gun.