NASA has called off plans to launch a small cubesat to the moon on Monday (June 27) to allow more time to check its Rocket Lab booster for flight. 

The U.S. space agency announced today that it was no longer targeting a Monday launch for the new CAPSTONE cubesat to the moon on an Electron booster built by Rocket Lab. The mission, led by the company Advanced Space, was scheduled to launch from a pad on Mahia Peninsula, New Zealand at 6 a.m. EDT (1000 GMT) on Monday. 

Source