In the midst of the hurricane in Puerto Rico and his feud with the National Football League (NFL), Donald Trump is once again back on the attack against North Korean leader Kim Jong-un. In his latest ranting on Twitter, the president took his threat to another level.

Trump on Kim

In the nine months that Donald Trump has been the President of the United States, he's caused constant turmoil in Washington. Whether it's his controversial rhetoric, questionable policies [VIDEO], or bickering between the Democratic Party or his fellow Republicans, the former host of "The Apprentice" has not held back his thoughts regarding the backlash that follows.

Not long after Trump defeated Hillary Clinton and was sworn into office, he took a shot at North Korea and Kim Jong-un. That rift between the United States and the rival nation has only escalated in recent weeks after Kim decided to launch several test missiles in the region. In response, Trump lashed out on social media, insulting Kim with the nickname "Rocket Man" during one of his many tweets. Trump used the term once again in front of the United Nations General Assembly, name-dropping "Rocket Man," while vowing to "destroy" his country as a possible solution. Following Secretary of State Rex Tillerson's attempt to negotiate with Kim's regime, Trump gave his thoughts during another tweet on October 1.

Taking to Twitter on Sunday morning was Donald Trump, who praised Rex Tillerson, but noted that he should top "wasting his time" in trying to negotiate with Kim Jong-un.

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

In a follow-up tweet, Donald Trump doubled down on his attack while hinting at a possible military strike against North Korea. "Save your energy Rex, we'll do what has to be done!" the president added. Despite the negative feedback from his comments, it doesn't look like Trump is going to be changing his tune on the issue at any time in the near future.

Moving forward

As Donald Trump continues his rhetoric against North Korea, critics have accused the commander in chief of reckless behavior that could be detrimental for the world in the future. While Kim Jong-un hasn't responded to Trump's latest remarks, he did fire back last month by labeling the billionaire real estate mogul a "dotard" who was "mentally deranged." As of press time, North Korea has not issued a rebuttal.