Facing growing demands for him to resign, Minnesota Sen. Al Franken will make an announcement on Thursday.
Franken's office says he will speak on the Senate floor at 8:45 a.m. Pacific time.
Franken's support among his fellow Democrats is collapsing as a host of female Democratic senators including Sens. Patty Murray and Maria Cantwell from Washington state called upon him to quit.
The calls came as another woman accused Franken of sexual misconduct in an account to Politico.
Franken vehemently denied a new sexual misconduct accusation that came from a former Democratic congressional aide that he tried to forcibly kiss her after a taping of his radio show in 2006.
Murray said she was “shocked and appalled by Senator Franken’s behavior” in a tweet.
“It’s clear to me that this has been a deeply harmful, persistent problem and a clear pattern over a long period of time. It’s time for him to step aside,” she went on to say.
"Senator Franken's actions are disturbing, egregiousm and demonstrate a pattern of serious misconduct and abuse, It is time for Senator to Franken to resign from office," Cantwell said in a statement.
The Minnesota Democrat was the first senator to be publicly accused of sexual assault or harassment in the wake of the aftermath of the Harvey Weinstein harassment scandal that has rocked the country.
Lindsay Menz, a 33-year-old from Texas, told CNN that the senator pulled her in close and grabbed her buttocks while the two were posing for a picture at the Minnesota State Fair in 2010. Leeann Tweeden said Franken, while they were on a USO tour in the Middle East to entertain U.S. troops, stuck his tongue down her throat and pretended to grope her while she was sleeping in a later picture.
Last month Franken dismissed a question about what type of behavior should merit resignation for any lawmaker. He pledged to cooperate with a Senate Ethics Committee investigation and said he “is open” to making the results public.