AS AMERICA reels from the massacre of 17 people at a Florida high school, Donald Trump has suggested he’s willing to act.

THE brother of Florida shooter Nikolas Cruz has been committed to a psychiatric facility, as the family who took the murderer in says ‘we had this monster living under our roof and didn’t know’.

19-year-old Nikolas Cruz is described by his classmates and investigators as a troubled teen with a history of "disturbing" posts on social media. Cruz is charged with 17 counts of premeditated murder in Wednesday's Florida high school shooting.