In March, the Trump administration illegally arrested and detained Mahmoud Khalil, a graduate student at Columbia University and an advocate for Palestinian human rights. Khalil, a U.S. green card holder, was detained in New York while returning from an iftar dinner with his wife, Dr. Noor Abdalla, who is currently nine months pregnant. He was later put on a plane and sent to a detention facility in Louisiana without notice to his attorney or family. Since Khalil's arrest, the administration has doubled down on its unlawful policy of revoking people's green cards and visas based on their political beliefs and advocacy. To be clear: The First Amendment does not allow the government to retaliate against anyone for their speech. Ripping someone from their home, stripping them of their immigration status, and detaining them solely based on political viewpoint is an unconstitutional attempt by President Donald Trump to silence dissent. Political speech – however controversial som...