On March 21, 2018, Souki announced he would resign from office following an investigation by the Hawaii State Ethics Commission found that Souki sexually harassed multiple women through unwanted touching, kissing, and sexual remarks. It also found that he likely violated the state's Fair Treatment Law, which says lawmakers cannot use their position to obtain benefits or subject others to unfavorable treatment. As part of a settlement, Souki agreed to resign by March 31, pay a $5,000 fine, and not seek election for two years. According to the agreement, Souki admitted that he "touched and kissed more than one woman in ways that were inappropriate and unwelcome." The investigation into Souki began when Rachael Wong, the former head of Hawaii's Department of Human Services, filed a formal complaint against Souki. She said that Souki made inappropriate comments to her and made an inappropriate request for physical contact with her.