MAJOR demonstrations will be held outside the US embassy and at RAF Fairford today amid growing fears Donald Trump’s war on Iran will kill hundreds of thousands of people.Campaigners warned that Britain was at a “dangerous turning point” as the US-Israel bombings of Tehran continues to escalate.PM Sir Keir Starmer’s claims the US can only use British bases for so-called “defensive” bombings will be branded “nonsense” by Your Party leader Jeremy Corbyn MP, who is set to speak outside the embassy in central London.