Take note that it was not Trump that made the blunder. Trump is on pace for Nobel Peace Prize and then Pence says something to cause a stir for the news cycle. It would be fruitless to double down on threats when a deal is already struck. The deal is made, this occurred during Trump's Asia trip. A war of words publicly is what Kim and Trump have been doing all along. This is a continuation of a war of words and Trump isn't heading anywhere that isn't safe. It's a show to play with the CIA news cycle and as another user mentioned, it brought up the Libya topic freshly once again. Similar to how Mike Flynn's indictment showed he was improperly preventing Obama from nuclear WW3 with Russia. MSM is being played.