According to USCIS, under the Immigration and Nationality Act (INA),admissibility is generally a requirement for admission to the United States, adjustment of status, and other immigration benefits. The grounds that make foreign nationals inadmissible to the United States are generally described in section 212 of the INA.
The term “extreme hardship” is mentioned in a number of statutes of the Immigration and Nationality Act (INA),which was enacted by the U.S. Congress in 1952 and amended a number of times over the past sixty years.