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Vermont Sen. Bernie Sanders speaks at a rally in Boston, Massachusetts, Mar. 31, 2017. Reuters

Bernie Sanders may have lost the Democratic presidential primary last year, but his commitment to changing the party hasn’t wavered. The Vermont senator has been outspoken about many of President Donald Trump’s policies and now, he’s attempting to fire up his fan base to spark real change in the Democratic Party.

Sanders, 75, kicked off a cross-country tour last week in an attempt to spur a movement among his young supporters. The senator was set to visit eight states with other leaders in the party.

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“We need to transform the Democratic Party,” Sanders said during a Tuesday rally in Kentucky. “We need to open the doors of the Democratic Party to working people and to young people.”

Sanders also threw his support behind young leaders in the party, like 30-year-old Jon Ossoff, a filmmaker who ran for Congress in Georgia.

“I applaud the energy and activism in @ossoff’s campaign. His victory would be an important step in fighting back against Trump’s agenda,” Sanders tweeted Friday.

During his speech in Kentucky, Sanders harkened back to many of the key points of his own campaign for president.

“Our job is to take on the moneyed interests,” he said. “And the only way I know as to how we do that is by bringing millions of people into the political process, with a newborn understanding that we have got to get involved.”

Sanders has repeated many of his core stances in speeches and on social media since Trump took office, calling for a higher minimum wage and a renewed commitment to battling climate change. He’s spoken out against some of the president’s recent moves like increasing military spending while cutting other budgets.

“Our job now is to involve millions of people into the political process who previously were not involved,” he tweeted Thursday.

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Vermont Sen. Bernie Sanders speaks at a rally in Boston, Massachusetts, Mar. 31, 2017. Reuters