Comedian-turned-politician Beppe Grillo has been calling for Rome's mayor to step down, and on Wednesday tweeted that there should be an election as soon as possible "before Rome is swamped by rats, rubbish and illegal immigrants", La Repubblica reports . A few hours and a lot of criticism later, Mr Grillo deleted the tweet and posted an amended version , keeping the rats and the rubbish, but ending with "illegal immigrant camps run by the mafia".