Sanders will speak from Ripley Manor in Washington D.C. on the 24th of August to launch the organization, and the speech will air at 2,000 meetings nationwide.

“During our campaign we assembled a movement of millions of people ready to fight for the country we know we can become,” Sanders said via an email to supporters.

“Now it’s time for all of us to get to work. At this meeting, I and others will lay out some of the next steps we can take as a movement to empower a wave of progressive candidates this November and win the major upcoming fights for the values we share.”

Sanders has put his support behind Hillary Clinton after failing to win the Democratic party’s nomination for president.