"It is now far stronger and more powerful than ever before," Mr. Trump added, seemingly sending a message for a second straight day to the North Korean leader Kim Jong Un.
But while the President was talking tough, his Secretary of State was trying to downplay the situation, as he visited the region.
"I think Americans should sleep well at night, I have no concerns about this particular rhetoric over the last few days," said Secretary of State Rex Tillerson, during a stop in Guam, the U.S. island territory, which was directly threatened with attack by North Korea in the aftermath of Mr. Trump's 'fire and fury' remarks.
"I do not believe there is any imminent threat," Tillerson told reporters.
As for the Congress - which is spread around the country during a summer legislative break - most of the reaction was coming from Democrats, who publicly urged the President to back off his tough rhetoric against Pyongyang.
"This saber-rattling from the President is dangerous," said Rep. Barbara Lee (D-CA). "We need to de-escalate tensions so that diplomacy can work."
"If ever we needed a steady hand, it's now," said Rep. Seth Moulton (D-MA). "We need a strong, smart, strategic plan - not empty threats."
Most Republicans in the Congress were staying silent on social media about the President's 'fire and fury' declaration, with some urging North Korea's main ally to rein in Kim Jong Un.
"China must be responsible for bringing North Korea to the table," said Rep. Mike Turner (R-OH).
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