SpaceX delays today’s Falcon 9 launch due to sensor issue, will try again tomorrow

Update 7:20AM ET, April 30th: Sunday morning, SpaceX stopped the launch of its Falcon 9 less than a minute before take off, citing an issue with one of the sensors on the first stage. The company will try to launch vehicle again tomorrow at 7AM ET.
On Monday, SpaceX is slated to do its very first national security mission for the US military — sending a spy satellite into orbit for the National Reconnaissance Office. Dubbed NROL-76, the secretive payload is scheduled to go up on the compan