Maybe it's just me. I am getting older, so perhaps I just don't remember. Or, I may have been younger and not paying attention ... but I don't recall presidential candidates going on foreign relations tours, meeting with heads of state and presenting their own view of what the U.S. should/should not be doing in terms of our relations with other nations.
Regardless of whom you support for the November election, any candidate promoting their own idea of foreign relations with foreign heads of state can have the potential to undermine the current administration's efforts. And such meetings are conducted without the benefit of full knowledge of what the current administration is doing or has done.
Now, many don't like the current foreign relations positions of the current administration. That, however, is not the point. If it's okay to undermine or contradict the official position of the U.S. government when you don't like that position, it is equally okay to undermine or contradict the official position when you DO like it. It can't be just a one-sided position, based upon your own opinion/perspective.
So I'm disappointed that any presidential candidate would act in such a manner. It's one thing to tell the American people what your foreign relations positions would be. It's another thing entirely to try and drum up support for them from foreign nations and citizens.