Trump pivots from Puerto Rico Twitter attacks -- and threatens ‘Little Rocket Man’ Kim Jong-un with ‘what has to be done’
President Donald J. Trump addresses the nation on the South Asia strategy during a press conference at Conmy Hall on Fort Myer, Va., Aug. 21, 2017. (DoD photo by Army Sgt. Amber I. Smith)

Moving on from criticizing officials in Puerto Rico, President Donald Trump once again went after North Korean leader Kim Jong-un on Twitter by hinting at military action.

According to Trump's tweets, "I told Rex Tillerson, our wonderful Secretary of State, that he is wasting his time trying to negotiate with Little Rocket Man."

Moments later, Trump indulged in a bit of saber-rattling, writing, "Save your energy Rex, we'll do what has to be done!"

You can read the tweets below: