President Trump said he's told Secretary of State Rex Tillerson to stop negotiating with North Korea because "we'll do what has to be done."

"I told Rex Tillerson, our wonderful Secretary of State, that he is wasting his time trying to negotiate with Little Rocket Man," Trump tweeted Sunday. "Save your energy Rex, we'll do what has to be done!"

...Save your energy Rex, we'll do what has to be done! — Donald J. Trump (@realDonaldTrump) October 1, 2017

It's another saber-rattling comment from Trump in his war of words with the North Korea regime.

Trump has made similar comments in the past, including one threatening that Kim Jong Un and other top North Korean officials wouldn't "be around much longer" if they continued to threaten the United States.

The regime announced they saw that statement as a declaration of war and threatened to shoot down any American jets they believe threaten North Korea, even if the jets are outside North Korean airspace.

Tillerson said Saturday the United States has direct communication with the Kim regime.