Originally Posted by Demise

Present Without Admission or Parole [INA § 212(a)(6)(A)(i)]: Individuals present in the U.S. without being admitted or paroled are inadmissible. This ground of inadmissibility will be applied to anyone found within the U.S. who has entered the U.S. without inspection ("EWI").

While it is true that EWI inadmissibility does not apply in case when someone leaves US, however for those currently in US (and note that leaving on AP does not constitute departure) it might definitely be a problem. Especially that one would apply for AP while still in US, meaning still inadmissible under INA § 212(a)(6)(A)(i).