DHS did not fully comply with the public law. TSA and the Coast Guard prepared, and DHS submitted, a CAP to Congress in June 2020. Although the CAP identified corrective actions for one area, it did not address four issues we consider significant. We recommended that DHS, in consultation with TSA and Coast Guard, re-evaluate the assessment to determine if further corrective actions are needed or justify excluding significant issues from the CAP. DHS did not concur with the recommendation, but we consider DHS’ actions partially responsive to the recommendation. We consider the recommendation open and unresolved.