Visitors surrounded the Memorial in Washington, D.C., to pay tribute to the life and legacy Dr. Martin Luther King Jr.

The federal holiday is celebrated on the third Monday of January because it is near Dr. King's birthday of Jan. 15. He would have been 93 years old this year.

Dr. King was known for his nonviolent activism in the civil rights movement, which protested racial discrimination in federal and state law.

People from more than 100 grassroots organizations joined Martin Luther King III and his family in a march in Washington, D.C., on Monday. They're demanding the White House and Congress to pass voting rights legislation.

Vice President Kamala Harris also spoke in honor of Dr. King on Monday. She took the opportunity to advance the John Lewis Voting Rights Act, which would give the federal government more oversight in setting voting regulations.