Columbia University Student Protestor Arrested
And Trump warns there are many more to come.
On March 8, the Trump administration arrested Columbia University student Mahmoud Khalil for his pro-Palestinian activism. Khalil was in the U.S. legally and posses a "green card", which the administration indicates has been revoked. As of today (March 11), it is reported that Khalil is in a detention facility in Jena, Louisiana, and a New York federal judge has blocked his deportation pending review.
CNN provides a good overview of Khalil's arrest and current status.

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Numerous organizations have registered opposition to Khalil's arrest including FIRE, ACLU, Human Rights First, and a growing number of Jewish groups. There is no doubt Khalil's arrest will have a chilling effect on free speech, and could lay the groundwork for deporting any non-citizen who dares to disagree with a government position or policy.
Steve Vladeck provides an excellent overview of the legal framework behind Khalil's arrest and pending deportation. Vladeck addresses what he sees as the five key questions surrounding Khalil's case: where it will be resolved; the legal basis for his arrest; the legal basis for his deportation; the First Amendment implications; and is this really who we want to be as a society.

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"If anything is anti-American, it’s threatening non-citizens who are in this country legally and have committed no crimes with the specter of being arrested, detained, and removed for doing nothing more than speaking up on behalf of unpopular causes—even, if not especially, unpopular causes with which many of us may well disagree."
Source tags: FIRE, ACLU, Human Rights First, Steve Vladeck, CNN