welcome to bbc news. i'm rich preston. our top stories: with the us midterm elections just days away, president biden and former presidents obama and trump have all hit the campaign trail in the push for victory in a critical contest. it's a choice — a choice between two vastly different visions of america. this tuesday, you must vote republican in a giant red wave. iran admits supplying "a limited number" of drones to russia. ukraine says tehran has yet to come clean on the full extent of its involvement in the conflict. british police say extreme right—wing terrorist ideology was behind the firebombing of a migrant processing centre in the south—east of england.