Women who have accused Donald Trump of sexual misconduct and abuse will unite on Monday to demand the US Congress open an investigation into their claims.

More than a dozen women came forward with allegations of sexual misconduct against Trump during last year's presidential campaign.  They'll speak at a news conference organized by Brave New Films, a documentary group that released a film about the allegations last month.  The White House has denied the allegations.

This comes just before Tuesday's special election in Alabama to choose a new US Senator to fill the seat vacated by Trump's Attorney General Jeff Sessions.  Trump has endorsed and campaigned for Roy Moore, a problematic right-winger accused of sexually abusing teenage girls when he was a 32-year old local prosecutor. 

The specter of past sexual misconduct has plagued both major political parties, but the Trump endorsement - and many other episodes - gives many the impression that the Democrats discipline their scandal-plagued members, while the Republican party allows sex abusers to rise within its ranks.