Former astronaut and Sen. Bill NelsonClarence (Bill) William NelsonFlorida lawmakers blocked from entering facility holding migrant children Transportation Department watchdog to examine airplane cabin evacuation standards Hillicon Valley: Supreme Court takes up Apple case | Senate votes to block ZTE deal | Officials testify on Clinton probe report | Russia's threat to undersea cables | Trump tells Pentagon to create 'space force' | FCC begins T-Mobile, Sprint deal review MORE (D-Fla.) offered praise for Monday afternoon's space shuttle launch on his Twitter page.

Nelson tweeted:
It was a flawless launch for what will be one of the most technologically challenging missions to repair & extend the Hubble space telescope


And added:
This mission will demonstrate the success of humans interacting with machines in space to discover the unknown.