Trump vociferously has taken aim at accused Democrats, while apparently giving a pass to Republicans. Moreover, it was only a year ago that similar accusations against Trump dominated the headlines, with more than a dozen women accusing Trump of improper conduct or sexual assault. Many of the accusations surfaced after the release of a 2005 tape of Trump speaking graphically about kissing and groping women uninvited.

Many of the women have produced witnesses who say they heard about these incidents when they happened — long before Trump’s political aspirations were known. Three have produced at least two witnesses.

Such contemporaneous accounts are essential to establishing the credibility of the allegation because they reduce the chance that a person is making up a story for political purposes. In the case of sexual allegations, such accounts can help bolster the credibility of the “she said” side of the equation. Often, a sexual assault will occur behind closed doors. The contemporary corroborators can explain what they heard at the time and whether the story being told now is consistent with how the story was told years earlier. This does not necessarily mean an allegation is true, but it does give journalistic organizations more confidence to report on the allegation.

The Fact Checker first detailed some of the accusations against Trump during the 2016 campaign. That fact check also detailed the witnesses who backed up claims of sexual accusations against former president Bill Clinton — who, like Trump, insisted the women accusing him were not telling the truth.

Here’s a list of 13 women who have publicly come forward with claims that Trump had physically touched them inappropriately in some way, and the witnesses they provided. We did not include claims that were made only through Facebook posts or other social media, or in lawsuits that subsequently were withdrawn.