COMMENT: In his successful 2016 election campaign, Donald Trump used a number of slogans which he and his supporters repeated ad nauseam. They memorably included "lock her up" and "build the wall" - but the one that seemed to resonate most effectively with American voters, and still does, was "make America great again".
There is nothing wrong with the sentiment, but it has proved to be something of a chimera, since Trump has fallen into the habit of equating it with another slogan which is one of his favourites and which he also uses all the time.
As he meets world leaders at the United Nations this week, we are assured in pre-briefings that he will be focused on "putting America first".
It is a further sign of his lamentable inability to understand how the world really works that he does not recognise the disjunction between the two slogans - that "putting America first" is not necessarily the best way to "make America great again" and might actually work against that second objective.
If we look back at how the post-war global scene has played out, it is surely clear that one of the reasons for America's emergence as the world's premier power was the fact that they were willing to become the leading force in the establishment of major institutions that helped to create an international world order. It was not, in other words, their pre-eminence as a military or economic power, but their readiness to use that power, in conjunction with others, in international efforts to build peace and prosperity across the globe that made America a super-power.