they don't.

Marbury v. Madison, 5 U.S. 137 (1803)

Primary Holding

Congress does not have the power to pass laws that override the Constitution, such as by expanding the scope of the Supreme Court’s original jurisdiction.

https://supreme.justia.com/cases/federal/us/5/137/

revoking a visa for activities protected under the first amendment which is what was done in this case are unconstitutional and all they did was guarantee this guy a fat check for deprivation of rights