The US has accidentally left a vacuum that Europe has been taking advantage of to establish itself as a geopolitical power. Europe does not have to remain hooked to the shackles of the dependency that was the Cold War, but now, it can move in its own direction and make new alliances and address what concerns it.
The constitutional stakes are plain. The Bill of Rights protects speech, press, and the right “peaceably to assemble,” and it does not contain an immigration exception. International law says the same with sharper vocabulary.
