The Women’s March on Washington, a mass mobilization to champion women’s rights, is growing as President-elect Donald Trump’s inauguration approaches.

Organizers announced on Tuesday that several high-profile supporters, including Gloria Steinem and Harry Belafonte, will be joining the January 21 march as honorary co-chairs. Planned Parenthood has also signed on as a partner.

“This is a historic moment to come together to protect the progress we’ve made,” Planned Parenthood president Cecile Richards said in a statement. “We will send a strong message to the incoming administration that millions of people across this country are prepared to fight attacks on reproductive health care, abortion services, and access to Planned Parenthood, as they intersect with the rights of young people, people of color, immigrants, and people of all faiths, backgrounds, and incomes.”

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Although the organizers say the march aims to be “proactive about women’s rights” rather than to target Trump specifically, the connection between his incoming anti-choice administration and the organizers’ goals seems clear.

Linda Sarsour, a chair of the march and executive director of the Arab American Association of New York, previously described the march as a “stand on social justice and human rights issues ranging from race, ethnicity, gender, religion, immigration, and healthcare.”