Sen. Bernie Sanders (I-Vt.) on Tuesday called out President Donald Trump over his administration’s efforts to arrest and deport a Columbia University undergraduate student over her participation in a pro-Palestinian protest.

Yunseo Chung, a legal permanent resident who’s lived in the United States since moving from South Korea when she was 7 years old, sued Trump and other members of his team earlier this week, claiming she was unlawfully targeted by Immigration and Customs Enforcement agents because of her involvement in the protest.

In a post on X, formerly Twitter, Sanders defended Chung, giving Trump a notable reminder.

“No, Mr. President,” Sanders said. “This is a democracy. You can’t exile political dissidents. Not in the United States.”

A Manhattan federal judge on Tuesday ruled that the administration cannot detain Chung for now, saying government lawyers had not presented any evidence to show the student was dangerous or had contact with terrorists or presented a risk to U.S. foreign policy.

Chung expressed relief at the court ruling.

“After the constant dread in the back of my mind over the past few weeks, this decision feels like a million pounds off of my chest,” Chung told The Guardian in a statement. “I feel like I could fly.”

Chung was among demonstrators who were arrested earlier this month for taking part in a sit-in protest against the expulsion of three students from Barnard, Columbia’s sister college. She was released and given a standard charge of obstructing of governmental administration, a misdemeanor charge.

ICE agents subsequently tried to locate her, searching her parents’ home and her university housing, after officials told her lawyer her permanent status would be revoked.

Following the conclusion of Tuesday’s court hearing, Chung’s lawyer Ramzi Kassem said his client was targeted “simply because her viewpoint, her speech, her First Amendment-protected speech — it happens to be something that they disagree with.”