Women have marched in hundreds of US cities and overseas to mark the second anniversary of demonstrations the day after President Donald Trump's inauguration in January 2017.
Women's March, a national nonprofit organisation that evolved from the initial Washington march, again hosted its main event in Washington on Saturday, with hundreds of "sister" marches in other cities.
Leaders of both groups said they would use this year's marches to push policy related to raising the minimum wage, access to reproductive healthcare and voting rights, among other issues.
They are aiming to mobilise women to vote ahead of the 2020 elections, when Trump is expected to be the Republican nominee for president.
"There is definitely huge, huge focus on the 2020 elections," March On's Natalie Sanchez said.
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US Senator Kirsten Gillibrand, who launched her bid for the 2020 Democratic presidential nomination this week, addressed the women's march in Des Moines, Iowa.
She told the crowd that the 2017 march was one of the most influential political moments in her life.
"Now is the time to get off the sidelines. Our democracy only works when people like you stand up and demand it," Gillibrand said.
