There is only one rational solution to this situation, and that is to negotiate a permanent peace treaty with North Korea to officially end the Korean War. North Korea is not going to give up its nuclear program as long as its leaders are convinced that they are under threat. Nor can the US atack them since there is no military scenario in which tens of millions of innocent people die.
The great orange negotiator should be looking at negotiating peace instead of tweeting nonsensical threats.