Republican U.S. Rep. Blake Farenthold of Texas, accused by a female former aide of sexual harassment, abruptly resigned from Congress on Friday after admitting to allowing an unprofessional culture to flourish in his Capitol Hill office.

"While I planned on serving out the remainder of my term in Congress, I know in my heart it's time for me to move along and look for new ways to serve," the 56-year-old congressman who represented Corpus Christi in the U.S. House of Representatives said in a social media video statement.

While Farenthold has denied the sexual harassment accusation, the former conservative radio show host said in December he would not seek re-election. He made that announcement a week after the House ethics committee said it was investigating him over allegations of sexual harassment, discrimination and retaliation involving a female former staff member.