On Tuesday afternoon, Oprah Winfrey said she would match the Clooney's donation.
“George and Amal, I couldn’t agree with you more,” Winfrey tweeted. “I am joining forces with you and will match your $500,000 donation to ‘March For Our Lives.’ These inspiring young people remind me of the Freedom Riders of the 60s who also said we’ve had ENOUGH and our voices will be heard.”
The March for Our Lives event was announced by Students David Hogg, Alex Wind, Cameron Kasky, Jacqueline Coren and Emma Gonzalez, five survivors of the Marjory Stoneman Douglas High School shooting. On Feb. 14, 19-year-old Nikolas Cruz opened fire at the school, killing 17 people.
Related: Florida school shooting timeline: Seven minutes, three floors and 17 dead
Cruz has been charged with 17 counts of premeditated murder.
The March For Our Lives march will be in Washington, D.C. According to the group's website, "the kids and families of March For Our Lives will take to the streets of Washington DC to demand that their lives and safety become a priority and that we end this epidemic of mass school shootings."