This is an interesting thread, one I'd never found in all this time.
A lot of good points are here already.
I do think it's notable that Gandalf says nearly the same thing to the Lord of the Nazgûl, when the latter is threatening to ride into Minas Tirith.
Quote:
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'You cannot enter here,' said Gandalf.
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In both instances Gandalf seeks to bar a foe from getting by him, and uses similar verbiage.
I don't think there was any connection between Gandalf's words and generic partisan-speak, at least not in Tolkien's mind.