A large crowd walks down Pennsylvania Avenue after the start of the Women's March on Washington on Saturday, January 21, 2017. Organizers said the march is sending a message to Donald Trump that "women's rights are human rights." Similar protests unfolded across the country. Mark Kauzlarich for CNN

A woman chants at the Women's March on Washington. Mario Tama/Getty Images

Women with cat hats walk past the Capitol. Gabriella Demczuk for CNN

Demonstrators at the Women's March rally toward the White House on the National Mall. Gabriella Demczuk for CNN

Demonstrators take a break from marching at the National Gallery of Art. Gabriella Demczuk for CNN

Protesters gather on the National Mall near the US Capitol. ANDREW CABALLERO-REYNOLDS/AFP/Getty Images

Protesters gather near the US Capitol. Mario Tama/Getty Images

Lily Donahue of Wappingers Falls, New York, center, is among the thousands with signs protesting violence against women. John Minchillo/AP

The pink "pussyhat" with cat ears became the symbol the the Woman's March on Washington as a reference to President Donald Trump's remarks about grabbing women by their genitalia during the election. ANDREW CABALLERO-REYNOLDS/AFP/Getty Images

Madonna performs during the Women's March on Washington, Saturday, January 21, 2017 in Washington. Jose Luis Magana/AP

The march evolved from a post-election call to action on Facebook to an organized effort that included high-wattage activists and attendees. Teresa Kroeger/FilmMagic/Getty Images

A woman wears a pink hat to send a message during the protest. ANDREW CABALLERO-REYNOLDS/AFP/Getty Images

Demonstrators wearing pink hats gather during the Women's March on Washington in Washington, DC, on Saturday, January 21, 2017. Eric Thayer/Bloomberg/Getty Images

Singer Alicia Keys performs on the National Mall in Washington, DC, for the Women's March on January 21, 2017. ANDREW CABALLERO-REYNOLDS/AFP/Getty Images

Demonstrators arrive at Washington's Union Station for the march. Jessica Kourkounis/Getty Images

Ginny Suss, Carmen Perez, Gloria Steinem, Linda Sarsour, Tamika Mallory and Mia Ives-Rublee appear onstage during the Women's March on Washington on January 21, 2017 in Washington, DC. Theo Wargo/Getty Images

Demonstrators protest on the National Mall in Washington, DC, for the Women's March on January 21, 2017. ANDREW CABALLERO-REYNOLDS/AFP/Getty Images

Ginger Naglee of Olney, Maryland, gets into the spirit on Independence Avenue. Sait Serkan Gurbuz/AP

Women gather on a barricade on the National Mall. John Minchillo/AP

A man dressed as Abraham Lincoln stands with protesters. John Minchillo/AP

Protesters take a selfie on the grounds of the US Capitol. Jessica Kourkounis/Getty Images

Demonstrators protest on the National Mall in Washington, DC, for the Women's March on January 21, 2017. ANDREW CABALLERO-REYNOLDS/AFP/Getty Images

Girls hold anti-Trump signs during the march. John Minchillo/AP