Former President Obama on Saturday tweeted a message of support for students participating in the "March for Our Lives" rallies calling for action on gun violence.

Obama tweeted that he and former first lady Michelle Obama Michelle LeVaughn Robinson ObamaTo honor Justice Ginsburg's legacy, Biden should consider Michelle Obama National Urban League, BET launch National Black Voter Day The Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill MORE are "inspired" by those who organized the marches taking place in Washington, D.C., and cities around the world.

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"Michelle and I are so inspired by all the young people who made today’s marches happen," he wrote. "Keep at it. You’re leading us forward. Nothing can stand in the way of millions of voices calling for change."

Hundreds of thousands of young people gathered for the marches on Saturday, which were slated to take place in all 50 states and on six continents.

The student survivors of the February shooting at a Florida high school organized the movement to call on lawmakers to act on gun control and school safety.

In D.C., organizers obtained a permit for 500,000 people to rally downtown.

Survivors of the Florida shooting and several other student activists from across the country, some as young as 11 years old, delivered speeches at the event. Celebrities and lawmakers also joined the marches.

President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE spent the weekend at Mar-a-Lago, his private resort in Florida. The White House released a statement Saturday applauding the activists for "exercising their First Amendment rights."