♪ ♪ it will be here. hillary clinton's e-mail controversy is beginning to cost her maybe in the polls. >> a new cnn poll shows that more than half of respondents say it's a serious problem. and more than half say she hasn't explained herself enough. it comes as house speaker john boehner is expected to announce a new investigation into the matter. abc's karen travers has the latest. >> reporter: the controversy over hillary clinton's e-mail activity is just not dying down. top house republicans tell abc news, they expect the house speaker to launch a new investigation into her e-mail practices when she was secretary of state. including her admitted destruction of about 30,000 e-mails that she says were purely personal. >> e-mails about planning chelsea's wedding. my mother's funeral arrangements. condolence notes to friends.