Bernie Sanders

Democratic presidential candidate Sen. Bernie Sanders, I-Vt., is cheered by supporters supporters during a campaign rally at the Lexington Convention Center, Wednesday, May 4, 2016, in Lexington Ky. (AP Photo/Timothy D. Easley, File)

U.S. Sen. Elizabeth Warren, D-Massachusetts, and U.S. Sen. Bernie Sanders, I-Vermont, will headline a Boston rally this Friday.

Sanders, who ran for the Democratic nomination for president in 2016 but lost to Hillary Clinton, and Warren have emerged as the leaders of the progressive wing of the Democratic Party.

The rally is sponsored by Our Revolution, a political action group spun out from Sanders' presidential campaign. Raise Up Massachusetts, a liberal organizing group that has advocated for state policies like increases to the minimum wage and mandated earned sick time, will also participate.

The rally is being billed as a way for speakers to talk about economic justice and speak out against Republican President Donald Trump's agenda.

Warren has recently been one of the strongest Democratic voices in the Senate opposing Trump.

The rally will be held at the Orpheum Theater in Boston at 7:30 p.m. on Friday, March 31.