Rubio is re-considering it. I got a note from a friend earlier this week saying he gets the sense Marco is going to run. Right now he is thinking about it.
The field in Florida is beginning to clear for him. Carlos Lopez-Cantera is willing to get out if Rubio gets in. They are friends.
Rubio, according to several people, says the events of this past week in Florida have compelled him to re-consider. He cares passionately about the national security issue and this happened on his turf.
Republicans in Washington have been desperate for Rubio to run again. They believe he can keep the seat in the hands of the GOP even with Trump as the nominee.