"At least one of the Republicans on the committee, Jeff Flake of Arizona, has expressed reservations about Kavanaugh, but is yet to signal how he might vote."
(The Guardian.)
What is the implied subject of the clause but is yet to signal in the sentence above? Is it a dummy "it" or the personal pronoun "he"?
he I would write it as . . has yet to signal .
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The subject of "is yet to signal" is the same as the subject of "has expressed reservations", i.e. "At least one of the Republicans on the committee".