The Supreme Court early Saturday morning paused the deportation of immigrants potentially subject to the Alien Enemies Act, freezing action in a fast-developing case involving a group of immigrants in Texas who say the Trump administration was working to remove them.

Donald Trump has sent accused Venezuelan gang members to a notorious prison in El Salvador, invoking the 1798 Alien Enemies Act, which gives the president power to detain and deport natives or citizens of "enemy" nations without usual processes. The act was previously used only three times, all during war.

The case raises questions about the Trump administration's adherence to limits set by the Supreme Court. It carries the risk of a significant clash between the two coequal branches of government and potentially a full-blown constitutional crisis.