Most of his Tweets seem harmless enough, and some are just plain strange.
However, he is undoing some of the things he has on his agenda by tweeting.
The Travel ban tweets he made, 3 of them illustrate this.
He complained that the DOJ version of the EO (which he signed, by the way) wasn't strong enough, yet the original "stronger" version was rejected by the courts.
He is running the risk of the court not overturning the lower court ruling, based on the tweet that says he is in favor of the stronger version, which was rejected.
It appears that he is not thinking clearly on this issue, with these tweets.
A conspiracy theory:
What if, after his meetings in the Middle East, he agreed not to pursue the Travel Ban, and this is his way of sabotaging it, and still gaining the political capital, by telling us all, he really wants this, but the courts and the DOJ are hindering him?
So, is he doing this on purpose, or is he not thinking it through?