This kind of attitude by Trump really disappoints me. I'm not in favor of a Muslim ban, or travel ban. What bugs me is that he's not willing to apologize even to achieve something he wants to achieve. This "no compromise" attitude indicates (to me) very autocratic tendencies. By apologizing he has the chance to give his party a win, and help boost their chances in the mid terms, where it looks like they may need the help to maintain control of the senate. It's almost like he's self isolating, and moving away from the party so that when (if) things do go sideways for his nominal party he has deniability. I'm kind of searching here but it seems like a kid, frustrated that they're not playing the game his way, taking his ball and going home. If the rest of the government won't play the game "right" according to his rules, it seems like he's vengeful enough to make sure that NOBODY gets to be right by making it difficult for the rest of the government to operate. And before you start thinking to yourself "He's a nut! It's not about Trump being vengeful, it's about him being a crazy nut" read the following article.
https://www.reuters.com/article/us-usa-trump-government/trump-threatens-government-shutdown-in-september-if-no-funding-for-wall-idUSKBN1I0018 I guess Mexico never got on board with paying for it? Quelle surprise.