During an interview with CNN's Abby Phillip on Sunday, Warren, a Democrat, asked, "how about if we're unified against insurrection? How about if we're unified for accountability?" ahead of the impeachment trial.
"Unity starts with accountability," Warren added.
The House of Representatives impeached Trump earlier this month for his role in inciting the violent Capitol riot, which left five dead. Democratic House Speaker Nancy Pelosi said that the House will deliver the impeachment charge on Monday.
Senate leadership, however, agreed to delay Trump's impeachment trial until the week of February 8 to allow President Joe Biden time to start his legislative agenda and legal teams space to prepare their arguments.
"The January 6th insurrection at the Capitol incited by Donald J. Trump was a day none of us will ever forget," said Senate Majority Leader Chuck Schumer during a floor speech. "We all want to put this awful chapter in our nation's history behind us. And healing and unity will only come if there is truth and accountability, and that is what this trail will provide."
Before the trial starts, "the Senate will continue to do other business for the American people, such as Cabinet nominations and the COVID relief bill, which would provide relief for millions of Americans who are suffering during this pandemic," Schumer added.
When asked if she believed Republican opposition to Trump would dissipate the longer the Senate waits to start the trial, Warren said she "can't imagine how Republican opposition to insurrection would fade over the space of a couple weeks."
"We are talking about a president who stood in front of a mob and told them to go to the Capitol and invade, told them to go the Capitol and stop the lawful business of government so that he could try to stay in the White House," said Warren. "That is so fundamentally wrong."
She continued: "We need accountability, accountability for Donald Trump and accountability for everyone who participated in that insurrection."
Warren added that lawmakers need to unify to do "the work that the American people want done."
The Massachusetts senator noted this may include raising the minimum wage to $15 an hour, canceling student loan debt, expanding Social Security, and granting more universal child care.
"It's not about ideology. It's not about helping just the richest Americans, or some interest group," said Warren. "We want to have unity, then get on board the things the American people want to see us do."
Newsweek reached out to Warren's office, but didn't hear back in time for publication.