Comment Re:Maybe foreign countries should demand... (Score 1) 189
No. As a head of state, he has diplomatic immunity when he travels to a foreign country. If he were arrested, it would violate customary international law, and perhaps also treaties. The immunity is not absolute, but damn near.
I suppose a foreign country could try to do it, but without just cause (e.g., for grave international crimes) the consequences could be significant. They could include at least commensurate retaliatory action (expelling diplomats, etc.)
This principle applies, for example, when foreign diplomats come to the USA to address the UN, even from countries the USA is not all that fond of.
But once he's out of office, he no longer has immunity.