By Eileen M. Martin ( October 29, 2026, 2:42 PM EDT) -- A ground of inadmissibility is a legal reason, set out in the Immigration and Nationality Act (INA), that bars a foreign national from entering the United States. Did you know that every time a foreign national enters the U.S., a U.S. CBP officer makes a determination on whether the officer believes there is a relevant ground of inadmissibility that applies? If the officer determines that there is, U.S. immigration law prevents him or her from permitting that foreign national to enter the U.S....