He said they call into question the Prime Minister's decision to appoint Mr Crosby to run the Conservative election campaign in 2015.
These are very serious allegations, which call into question the Prime Minister's decision to appoint Lynton Crosby.
These allegations must be investigated and if they are true, David Cameron must condemn them.
Appointing the arch right-winger who ran the Tories' 2005 election campaign shows once again that David Cameron can't be the One Nation Prime Minister Britain needs.
More top news
A man who used a pickaxe and sledgehammer to ruin Donald Trump's Hollywood Walk of Fame star has avoided jail.
Wet, windy and turning wintry
A bull which escaped from an abattoir led police on a two hour wild goose chase through the streets of New York.