Unmasking itself is not illegal. But, ask yourself, why do they mask? It's to protect the rights of American citizens. There has to be a compelling national interest to unmask. Here, the compelling interest in at least one case appears to be to leak to the press, and that is illegal.
Also, given who requested unmasking and when they did it, and what happened afterwards, it certainly seems like they were doing it to take down the following administration, which is banana republic type of behavior on the part of the Dems. But, I'm sure there is more information to come.
Like I say, though, be careful what behavior your defend, because Trump gets to do everything you defend.
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