One of the crew members is experiencing "minor health problems" unrelated to COVID-19, according to a statement from the US space agency.
At the same time, the release does not specify which of the astronauts it is about.
The agency noted that the nearest time for launch is 23:36 on November 6 (06:36 Moscow time on November 7).
Earlier, the US aerospace agency postponed the launch of the Crew-3 and SpaceX mission to the ISS due to unfavorable weather conditions to November 3.