The Board of Immigration Appeals (BIA) has determined that an Immigration Judge does not have jurisdiction to grant a waiver of inadmissibility to a U visa petitioner. In so doing, the BIA breaks with the Seventh Circuit on this issue.
The full text of Matter of Khan can be found here:
https://www.justice.gov/sites/default/files/pages/attachments/2016/09/08/3870_0.pdf