Twitter has deleted a tweet posted by US President Donald Trump's personal lawyer Rudy Giuliani and Republican activist Charlie Kirk for violating its rules over novel coronavirus misinformation. Giuliani posted a tweet: "Hydroxychloroquine has been shown to have a 100% effective rate treating Covid-19. Yet, Democrat Gretchen Whitmer is threatening Doctors who prescribe it. If Trump is for something - Democrats are against it. They're ok with people dying if ...