A ballon depicting U.S President Donal Trump floats in the water as demonstrators gather in front of the Lincoln Memorial for the "Get Your Knee Off Our Necks" march in support of racial justice that is expected to gather protestors from all over the country in Washington, U.S., August 28, 2020.

Rep. Ayanna Pressley (D-MA) wearing a protective mask poses for a photo at the Lincoln Memorial during the 'Get Your Knee Off Our Necks' march in support of racial justice, in Washington, U.S., August 28, 2020. Michael M. Santiago/Pool via REUTERS

Rev. Al Sharpton and Martin Luther King III, eldest son of Martin Luther King Jr., and his wife Arndrea Waters King begin the "Get Your Knee Off Our Necks" Commitment March on Washington 2020 following a gathering at the Lincoln Memorial in Washington, U.S., August 28, 2020.

Tamika Palmer, the mother of Breonna Taylor, who was shot by police in her apartment in Louisville, Kentucky, reacts at the Lincoln Memorial during the 'Get Your Knee Off Our Necks' march in support of racial justice, in Washington, U.S., August 28, 2020. Olivier Douliery/Pool via REUTERS

12-year-old Yolanda Renee King, granddaughter of Rev. Martin Luther King Jr., thrusts her fist as she speaks to the "Get Your Knee Off Our Necks" Commitment March on Washington 2020 from the spot where her grandfather delivered his "I Have a Dream" speech 57 years ago in Washington, U.S., August 28, 2020.

Rev. Al Sharpton, whose National Action Network organized the "Get Your Knee Off Our Necks" March on Washington in support of racial justice, looks out at the rally and march from the top of the steps of the Lincoln Memorial in Washington, U.S., August 28, 2020.

People gather around the Lincoln Memorial Reflecting Pool during the 'Get Your Knee Off Our Necks' march in support of racial justice, in Washington, U.S., August 28, 2020. Olivier DOULIERY/Pool via REUTERS

Members of Vaughn 17 group protest against prision inmate treatment at Black Lives Matter Plaza near the White House during the "Get Your Knee Off Our Necks" march in support of racial justice that is expected to gather protestors from all over the country in Washington, U.S., August 28, 2020.

Demonstrators take part in "Get Your Knee Off Our Necks" March on Washington 2020 in support of racial justice, in Washington, U.S., August 28, 2020.

A demonstrator pumps his fist as others gather in front of the Lincoln Memorial for the "Get Your Knee Off Our Necks" march in support of racial justice that is expected to gather protestors from all over the country in Washington, U.S., August 28, 2020.

Rev. Martin Luther King Jr's granddaughter Yolanda Renee King stands with her father Martin Luther King III on the spot where her grandfather gave his "I Have a Dream" speech 57 years ago today as she addresses the "Get Your Knee Off Our Necks" Commitment March on Washington 2020 in Washington, U.S., August 28, 2020.

A balloon with the words "I Can't Breathe" flies away into the sky at the "Get Your Knee Off Our Necks" Commitment March on Washington 2020 at the spot where Rev. Martin Luther King Jr delivered his "I Have a Dream" speech 57 years ago today in Washington, U.S., August 28, 2020.

A protester holds a Black Lives Matter flag as he wades into the waters of the Lincoln Memorial reflecting pool as demonstrators gather for the "Get Your Knee Off Our Necks" March on Washington in support of racial justice in Washington, U.S., August 28, 2020.

Demonstrators gather next to the Martin Luther King, Jr. Memorial for the "Get Your Knee Off Our Necks" march in support of racial justice, in Washington, U.S., August 28, 2020.

A demonstrator holds up a Black Lives Matter sign in front of the statue of President Abraham Lincoln at the Lincoln Memorial during the "Get Your Knee Off Our Necks" Commitment March on Washington 2020 at the spot where Rev. Martin Luther King Jr. delivered his "I Have a Dream" speech 57 years ago today in Washington, U.S., August 28, 2020.

Rev. Martin Luther King Jr's granddaughter Yolanda Renee King speaks at the Lincoln Memorial during the 'Get Your Knee Off Our Necks' march in support of racial justice, in Washington, U.S., August 28, 2020. Olivier Douliery/Pool via REUTERS

March organizers and leaders including Rev. Al Sharpton and Martin Luther King III, hold a banner during the 'Get Your Knee Off Our Necks' march in support of racial justice, in Washington, U.S., August 28, 2020. Olivier Douliery/Pool via REUTERS

Protestors stand in the middle of the Lincoln Memorial reflecting pool in front of the Washington Monument as families of people killed by police address the "Get Your Knee Off Our Necks" Commitment March on Washington 2020 on the spot where Rev. Martin Luther King Jr delivered his "I Have a Dream" speech 57 years ago today in Washington, U.S., August 28, 2020.

A demonstrator holds a sign depicting George Floyd who died in Minneapolis police custody, during a "Get Your Knee Off Our Necks" March on Washington 2020 in support of racial justice, next to the Washington Monument, in Washington, U.S., August 28, 2020.

People stand over BLM posters at Black Lives Matter Plaza during a "Get Your Knee Off Our Necks" march in support of racial justice near the White House in Washington, U.S., August 28, 2020.

Aaron Xavier Wilson holds a banner during a "Get Your Knee Off Our Necks" march in support of racial justice that is expected to gather protestors from all over the country in Washington, U.S., August 28, 2020.

Onyinyechi Ibeabuchi from California wears a mask as she attends a "Get Your Knee Off Our Necks" march at the Martin Luther King Jr memorial in support of racial justice that is expected to gather protestors from all over the country in Washington, U.S., August 28, 2020.

Activist Korey Wise poses for a photo during the 'Get Your Knee Off Our Necks' march in support of racial justice, at the Lincoln Memorial, in Washington, U.S., August 28, 2020. Michael M. Santiago/Pool via REUTERS

People gather around the Lincoln Memorial Reflecting Pool during the 'Get Your Knee Off Our Necks' march in support of racial justice, in Washington, U.S., August 28, 2020. Olivier DOULIERY/Pool via REUTERS

Actiivist Jay Vegas wears a noose while posing with participants at the Lincoln Memorial as demonstrators gather for the "Get Your Knee Off Our Necks" March on Washington in support of racial justice in Washington, U.S., August 28, 2020.