Tens of thousands of people have been holding rallies across all 50 US states in support of abortion rights.
They have been galvanised in opposition to a new Texas law that severely limits access to abortions in the state.
Pro-choice supporters across the country fear that constitutional rights may be rolled back.
In the coming months, the Supreme Court is set to hear a case that could overturn Roe v Wade - the 1973 decision that legalised abortion nationwide.
In Washington DC, demonstrators marched to the Supreme Court building, holding signs such as "Make abortion legal".
The start of the rally was disrupted by some two dozen counter-demonstrators.
"The blood of innocent babies is on your hands!" shouted one man, but he was drowned out by the singing and clapping of the crowd, the Washington Post newspaper reported.
One woman who attended a march said she was there to support a woman's right to choose.
"While I've never been faced with that choice fortunately, there are many women who have and our government and men have no say in the outcome when it comes to our bodies," Robin Horn told Reuters news agency.
