Professor Nathaniel Persily weighs in on whether or not a recent action by Donald Trump constitutes an illegal campaign contribution for The Daily Beast.

Trump sent a cease and desist letter to the Club for Growth with his corporate letterhead from his corporation’s lawyer which, experts say, might qualify as an illegal corporate contribution.

When Donald Trump gets annoyed with something, he has his crack team of lawyers handle it. Case in point: his current issue with the Club for Growth’s negative attack ads airing in Iowa, which use actual quotes from Trump in the past to paint him as supportive of national health care, imposing higher taxes, and his infamous 2004 line, “in many cases I probably identify more as a Democrat.”

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Stanford constitutional law professor Nathaniel Persily wasn’t completely convinced that the actual sending of the letter is an act related to the campaign, despite the fact that appears to have nothing to do with the business side of Trump’s life.

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“Although [Trump] may derive some benefit from it, it did not jump out to me as a violation of a campaign finance law,” Persily told The Daily Beast.