NEW: Secretary of State Marco Rubio calls for the civilized world to unite against an "encroaching darkness," urging nations to defend what they have built and

NEW: Secretary of State Marco Rubio calls for the civilized world to unite against an "encroaching darkness," urging nations to defend what they have built and fight back against those who seek to destroy it. "It is easy to destroy great things. It is far more difficult to make them. The enemies of…