Sen. Elizabeth Warren Elizabeth WarrenNo new taxes for the ultra rich — fix bad tax policy instead Democrats back away from quick reversal of Trump tax cuts It's time for newspapers to stop endorsing presidential candidates MORE (D-Mass.) says President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE fired James Comey as FBI director because he “wants to cut off any investigation” of his activities.

“I think that there’s just no doubt given the timing that the reason that Comey was fired was because Donald Trump wants to cut off any investigation,” she told CNN Wednesday. "This is a moment in history. Donald Trump has tried to put himself above the law.

“And that’s not how it works in America. The way it works in America is that investigations are independent, no matter how powerful you are, and that everyone has to follow the law.”

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Warren additionally demanded that Deputy Attorney General Rod Rosenstein explain his role in firing Comey to Congress.

“Let’s get the deputy attorney general in here ... and let’s put him under oath and let’s let him explain directly to the members of the Judiciary Committee right here in the United States Senate exactly what it is that Director Comey asked for last week.”

The White House announced Tuesday that Trump had fired Comey on the recommendation of Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE and Rosenstein, citing his handling of the probe into Democratic presidential candidate Hillary Clinton Hillary Diane Rodham ClintonBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Virginia Democrat blasts Trump's 'appalling' remark about COVID-19 deaths in 'blue states' The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally MORE's private email server.

“While I greatly appreciate you informing me, on three separate occasions, that I am not under investigation, I nevertheless concur with the judgment of the Department of Justice that you are not able to lead the bureau,” Trump wrote in a letter to Comey dated Tuesday.

Comey’s firing sent shockwaves through Washington, with many questioning the timing of his dismissal.

The former FBI director announced in March that the FBI was probing Russia’s alleged meddling in the 2016 presidential race, including potential ties between Trump’s election campaign and Russia.