Marjory Stoneman Douglas High School students are demanding action to stop the bloodshed.
Clooney said his family will attend the march, slated for March 24.
They will march in Washington and other cities to demand children and their families "become a priority" to U.S. lawmakers.
United States actor and director George Clooney and his wife Amal attend the premiere of the movie "Suburbicon" presented out of competition at the 74th Venice Film Festival on September 2, 2017 at Venice Lido.
La Française qui a montré son sein, médaillée d'argent — JO de Pyeongchang
Grands favoris pour l'or avant la compétition, les Tricolores ont parfaitement tenu leur rang dans l'épreuve de danse sur glace. Quelques heures plus tôt ce mardi, la France avait déjà récolté une médaille d'argent grâce à Marie Martinod en halfpipe.
The actor stated he and his family would be present for the march and will stand "side by side", along with the protestors for stricter gun control laws. 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.
"Our childrens' lives depend on it".
He said: "Amal and I are so inspired by the courage and eloquence of these young men and women from Stoneman Douglas High School".
The Never Again account, representing survivors, tweeted: "We want to express extreme gratitude for the wonderful donation that George Clooney and his family have made".
Les mods sont disponibles sur la version Xbox One — Cities Skylines
Ils ont ensuite été portés sur la console de Microsoft par Paradox Interactive et Tantalus Media. C'est grâce aux développeurs de Tantalus que cela est possible .
"We are overwhelmed with the support, and we can't wait to march".
The White House says President Donald Trump is supportive of efforts to improve background checks for gun purchases, but many want far more deep-seated reforms.
George and Amal Clooney announced on Tuesday a $500,000 donation to the "March for Our Lives" demonstration organized by the Florida school shooting survivors expected to take place next month.
March for Our Lives says its mission is to "demand that a comprehensive and effective bill be immediately brought before Congress to address. gun issues". We live in fear.
Avalanches, inondations: cinq départements en vigilance orange
Depuis ce lundi et jusquà mercredi 21 février, les chutes de neige sont et vont être conséquentes sur les Pyrénées. Depuis dimanche, ce sont 30 à 60 cm de neige qui sont tombées du Pays Basque jusqu'à la vallée du Louron.