The current investigation into the former FBI director is precisely what the First Amendment was designed to guard against.
Questions are swirling following the launch of a federal investigation into former FBI Director James Comey over a now-deleted social media post of seashells arranged in the numbers “8647” on the beach. (“Eighty-six” is commonly understood to mean “get rid of.” President Trump is the 45th and 47th President of the United States.) Was Comey calling for the assassination of Trump? Or was he, as he has since stated, expressing a political opinion about Trump?
If Comey’s post amounted to a siren song, beseeching others to kill the president, he can be punished for his speech. But should Comey’s post be viewed as political advocacy, which I argue it should, he is entitled to the full protection of the First Amendment. The genuine threat is not that a president’s life is in danger, but that the Trump administration is attempting to silence the speech of political adversaries. Even if it is unlikely that Comey faces anything more than a slap on the wrist for his post, the decision to open an investigation in and of itself should be worrisome. Comey has access to the media and resources to defend himself. Not everyone does. And the prospect of chilling political speech critical of government officials should concern all of us.

https://www.msnbc.com/opinion/msnbc-opinion/trump-investigation-james-comey-free-speech-rcna207797