Site: nolo.com
... Extreme hardship is not defined in the law itself, but is understood to mean hardship greater than what ... children with the qualified relative, a genuine belief that you had been complying with immigration laws ... They can include prior violations of immigration law or criminal charges, arrests, or convictions. ... of inadmissible applicants are not allowed to apply for a waiver in the first place, as a matter of law ... . illegally
are suspected of entering the U.S. to commit espionage, sabotage, or violations of U.S. laws ...