Article continues below advertisementDr. Aseem Malhotra, advisor to Health Secretary Robert F. Kennedy Jr.'s MAHA Action activist group, reportedly believes the COVID-19 vaccine caused both King Charles and Kate Middleton to develop cancer.Malhotra, who is also a cardiologist, is due to speak at the annual Reform conference in Birmingham, England, on Saturday, September 6, where he is expected to discuss his reason for why he believes the COVID-19 vaccine caused Charles and Princess Kate's cancers, both of whom announced their diagnoses in 2024.