Up to 500,000 people are expected to take part in the march, according to organisers' estimates,
Some major sponsors refused to participate, and local branches of the organisation broke away from the central office after allegations of anti-Semitism.
Leading unions, environmental groups, women's organisations and many Jewish movements also refused to participate.
The 2017 Women's March was the largest one-day protest in US history, with millions of people, including celebrities and politicians, attending.
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