(JTA) — Bernie Sanders officially launched his second campaign for president.

The 2020 campaign launched on Feb. 19 with an email to supporters and a tweet which included a nearly 2-minute campaign video and a request for support.

“I’m running for president. I am asking you to join me today as part of an unprecedented and historic grassroots campaign that will begin with at least 1 million people from across the country,” the tweet said, and provided a link to a fundraising page.

He is seeking the nomination of the Democratic Party, despite an unsuccessful bid in 2016. He is a self-described democratic socialist.

Sanders, 77, who was reelected for a third term to the Senate from Vermont as an independent last year, had been dropping hints for months that he would run for president.

“We began the political revolution in the 2016 campaign, and now it’s time to move that revolution forward,” Sanders told Virginia Public Radio on Tuesday morning.

His 2016 campaign recently came under fire for failing to adequately address allegations by female staffers that they suffered sexual harassment from campaign officials.

He has been an outspoken critic of how Israel handles its relationship with the Gaza Strip, while decrying what he sees as a double standard applied to Israel.

“Our campaign is about transforming our country and creating a government based on the principles of economic, social, racial and environmental justice,” Sanders wrote in his announcement email. “Our campaign is about taking on the powerful special interests that dominate our economic and political life. I’m talking about Wall Street, the health insurance companies, the drug companies, the fossil fuel industry, the military-industrial complex, the private-prison industry and the large multi-national corporations that exert such an enormous influence over our lives.”