Sen. Elizabeth Warren Elizabeth WarrenWarren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon No new taxes for the ultra rich — fix bad tax policy instead MORE (D-Mass.) called on thousands of protesters at the Women’s March on Boston to "fight back" a day after President Trump took office.

“Now we can whimper, we can whine, or we can fight back. Me, I’m here to fight back,” Warren told the crowd at the Boston Common.

Warren appeared at the rally, a “sister march” of the Women’s March on Washington, on Saturday as protesters took to the streets in cities across America to demonstrate against Trump.

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Warren served as prominent critic of Trump during the presidential campaign, taking to Twitter multiple times to slam the then-GOP nominee.

“The fact is that the playing field has been tilted badly in favor of those at the top for a generation now,” Warren said.

“And now, President Trump and the Republican Congress are ready to ram through laws that will tilt it even harder.”