However, the tweet did not seem to have gone down well with several Twitter users, including actor Kal Penn, who quoted the tweet asking if Trump's Twitter account could be suspended for "threatening violence" against North Korea?
"I think we ought to take a deep breath and wait and see how it plays out", the lawyer advised.
After highlighting the fact that even former President George W. Bush failed to rein in the North Korean dictator, he said Obama didn't even want to talk about it.
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White nationalists were protesting the city's decision to remove a statue of Confederate General Robert E. Lee, when they clashed with counter-protesters who also showed up.
Trump also retweeted a poll - from a mysterious Twitter account called Progress Polls - that showed 61% of respondents saying he is a better President than Obama.
The United States' defenses are "locked and loaded", the president tweeted.
"The president's most recent comments are recklessly belligerent and demonstrate a grave lack of appreciation for the severity of the North Korea nuclear situation", House Minority Leader Nancy Pelosi said.
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"It's not a dare", the president said. They're only doing it - but I will tell you, we have tens of millions of people in this country that are so happy with what I'm saying - because they're saying, finally we have a President that's sticking up for our nation and, frankly, sticking up for our friends and our allies.
Susan Rice believes that, "deterrence makes good sense", and that it necessarily entails keeping military action on the table, but, she warned, "preemptive war, if one was thinking of executing that, would be catastrophic for the Korean peninsula".
But if Pyongyang does attack Guam, "I have confidence that we have responses that are proportionate to the problem", Rice said.
Military 'Locked And Loaded' If North Korea Missteps
His comments come amid growing tensions between the United States and the rogue nation - over its nuclear program. In response, Mr Trump said North Korea should expect "big, big trouble" if anything happened to Guam.