Yet formal suspension is not the only way to thwart habeas corpus. The Trump administration’s efforts to detain and deport students, scholars, and others for their advocacy and participation in protests surrounding Israel’s war in Gaza show how habeas can be undermined without ever formally suspending the writ. With potential Supreme Court review over several of these cases looming—a certiorari petition in one of the lead cases is due in the Supreme Court on Sept. 21—it is important to consider what the Suspension Clause protects and why it remains so essential.