PROVIDENCE, R.I. (WLNE) -- At Brown University Wednesday night, Massachusetts Senator Elizabeth Warren voiced concern about what Jeff Sessions' resignation as Attorney General could mean for the probe into any possible link between President Trump's campaign and Russia.

"It just makes it all the more important that we protect the Mueller investigation," said Warren. "Everybody has to follow the rule of law, and that includes the President of the United States. He should not be permitted to shut down this investigation."

Warren was on campus to deliver the Governor Frank Licht Memorial Lecture, where she talked about Tuesday's midterms, and Democrats winning back the House, despite losing seats in the Senate.

"We just had an election yesterday. And here's the part that gives me hope. We have a whole lot of new Democrats coming in. Yay!" said Warren, adding that many of them ran on a very progressive agenda.

Warren's talk focused on the economy, from wealth inequality to student loan debt.

But she also pushed back against controversy about how she's spoken about her Native American heritage, which, it turns out, is distant.

"I took a DNA test," said Warren. "They can make of it what they want."

Sen. Warren used that moment to criticize President Trump, who has mockingly referred to her as "Pocahontas."

"I am not a tribal citizen," said Warren. "But every single one of us should be outraged when Donald Trump attacks Native Americans."

The night was not without its laughs, as Rhode Island Senator Sheldon Whitehouse introduced Warren, referring to her as "my brilliant colleague from our northern suburb, Massachusetts."

The Massachusetts Democrat didn't miss a beat, telling the crowd, "You have a fabulous Senator in Rhode Island. Jack Reed is wonderful."

Speaking to reporters after the lecture, Senator Warren dodged a question about whether or not she's considering running for president in 2020--saying right now she's focused on building a government that doesn't just work for the rich and powerful, but for everyday Americans.

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