President Donald Trump says his administration will announce plans as early as next week to spend billions more than it already is on missile defense - after saying his warning to North Korea of 'fire and fury' wasn't tough enough.

The United States' nuclear arsenal is in 'tip-top shape and getting better and getting stronger' since he signed an executive order demanding improvements, Trump said Thursday after a national security briefing, 'and we have it now in very, very good shape.' 

'I would like to de-nuke the world,' Trump stated. 'And until such time this scourge disappears we will be so much better and so much stronger than anybody else.'

Trump had rebuked critics of his heated 'fire and fury' threat to North Korea in earlier remarks on the topic of nuclear armament during a question and answer session with reporters.

'Maybe it wasn’t tough enough. They’ve been doing this to our country for a long time, for many years, and it’s about time that somebody stuck up for the people of this country and for the people of other countries,' Trump countered. 'So if anything, maybe that statement wasn’t tough enough.'

Trump said Kim Jong-Un should be 'very, very nervous' about U.S. retaliation. 'Because things will happen to them like they never thought possible, OK?' he said.  

He warned Kim in remarks from his golf club's doorstep not to even contemplate an attack on the U.S. or its allies or he will pay the ultimate price. Unlike previous American leaders, Trump said, he is not 'weak and ineffective' and will follow through on his threats. 'He has disrespected our country greatly. He has said things that are horrific. And with me he’s not getting away with it. He got away with it for a long time, between him and his family. He’s not getting away with it. This is a whole new ballgame. He’s not going to be saying those things and he’s certainly not going to be doing those things.

Trump said, 'I read about we’re in Guam by Aug. 15. Let’s see what he does with Guam. He does something in Guam, it will be an event the likes of which nobody’s seen before, what will happen in North Korea.'

An attack on Japan or South Korea would be just as provocative, Trump said. 'We’re going to be increasing our budget by many billions of dollars because of North Korea and other reasons having to do with the anti-missile.'

The president spoke to reporters ahead of a national security briefing this afternoon on the intensifying crisis with North Korea and right after in what turned into a mini-press conference. 

Trump's outburst at his doorstep in Bedminster came right as a leading expert on Northeast Asian affairs warned in conversation with DailyMail.com that North Korea could 'lash out' against the U.S. if it believes that a military assault is imminent.

'The wording itself I thought was over the top. It sounded like it had been penned by Pyongyang. I think it was a distraction and unhelpful,' The Heritage Foundation's Bruce Klingner said of Trump's previous address.

Heritage is a top-ranked think tank worldwide. It is the most influential conservative organization in the U.S. Its analysts are mostly aligned with Trump's administration. 

Trump's reaction to Kim's taunting 'could confirm growing concerns by our allies that the US is contemplating a preventative attack,' Klingner said in the moments before networks started airing video of Trump's claim to reporters that his 'fire and fury' rhetoric was maybe not strong enough.