Donald Trump’s private golf resort in South Florida will next week host one of the world’s leading purveyors of chlorine dioxide, a potentially life-threatening form of industrial bleach that is claimed without evidence to be a cure for cancer, Covid and autism. Andreas Kalcker is among 50 listed speakers at the “Truth Seekers Conference”, a two-day event opening on Thursday at the US president’s resort, Trump National Doral Miami. The event features several anti-vaxxers and other conspiracy theorists who have been brought together by the far-right commentator Charlie Ward. Kalcker, a German national thought to be living in Switzerland, markets...