The women were Paula Jones, who has accused Bill Clinton of propositioning her and exposing himself; Juanita Broaddrick, who claims Clinton sexually assaulted her; Kathy Shelton, who says Hillary Clinton defended a man who victimized her; and Kathleen Willey, who claims Bill Clinton groped her.
All four are expected to be in the audience tonight.
As for Broaddrick, who Trump has retweeted several times this weekend as he attempts to deflect his own scandal, when subpoenaed in relation to the Paula Jones case, Broaddrick filed an affidavit denying she was assaulted. She later changed her story. Ken Starr's team thoroughly investigated her claim and noted in his exhaustive Whitewater Report that Broaddrick had changed her story.
Congressional Republicans at the time did not think she was credible and she was not called to testify in Clinton's impeachment trial.
CNN's Jeff Zeleny passes on reaction from Clinton's spokeswoman Jennifer Palmieri:
"If that's the kind of campaign he wants to run, that's his choice. Voters aren't interested in this kind of campaign."