https://www.reuters.com/article/us-space-exploration-spacex/nasa-delays-launch-of-spacex-mission-citing-medical-issue-with-1-of-4-crew-members-idUSKBN2HM390

NASA on Monday announced a three-day delay in a SpaceX rocket launch of four astronauts to the International Space Station, the second postponement of the mission in a week, citing an unspecified medical issue involving one of the crew members.