Snapshots from Atlas 5 launch

In keeping with the agency’s strict medical privacy policy, NASA officials have not identified the astronaut in question or provided any details about the nature of the medical issue.

The shift in launch date is to allow more time to build in redundancy to account for the helium leak. The launch is currently scheduled for no earlier than Saturday, May 25, at 3:09 p.m. EDT (1909 UTC).

President Trump plans to visit the Kennedy Space Center in Florida next week to view the first launch of astronauts into orbit from U.S. soil in nearly a decade, according to White House officials.