Is there a name for the following type of pleonasm:
"It is John who runs." (instead of: "John runs.")
"It was congress that legislated." (instead of: "Congress legislated.")
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Grammars such as The Cambridge Grammar of the English Language (Huddleston & Pullum 2002) refer to such sentences as it-clefts.
Note that John runs does not have the same meaning as It is John who runs, and that the two examples may not even have the same truth values in the same contexts. The second is not a pleonasm.
No, I won't call it a passive voice. I'd describe it as a figure of speech, namely some kind of pleonasm using more words than strictly necessary to transport the information.