Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) said former FBI Director James Comey’s Thursday testimony heightened his concern that President Trump attempted to “derail an investigation of Russian meddling in our democracy.”

"What we learned today was deeply troubling and makes me more concerned than ever about President Trump’s attempts to derail an investigation of Russian meddling in our democracy," Sanders wrote in a statement.

Sanders pointed to Comey’s comments during a hearing about Russia’s election interference before the Senate Intelligence Committee on Thursday.

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"I was honestly concerned he might lie about the nature of our meeting,” Comey told the panel while explaining why he documented his interactions with the president.

"The administration chose to defame me and, more importantly, the FBI by saying that the organization was in disarray, that it was poorly run," the ousted FBI director added. "Those were lies, plain and simple."

"Remarkably, Mr. Comey said President Trump is a liar. He said his concern that Trump would lie about their meetings was why he detailed their encounters in writing,” the former Democratic presidential candidate noted, while also pointing to Comey’s claim that the White house attempted to smear his reputation and the FBI’s by describing it as being in a “disarray.”

White House deputy press secretary Sarah Huckabee Sanders pushed back and said Trump is “not a liar.”

“I can definitively say the president is not a liar,” the White House spokeswoman said during an off-camera briefing. “I think it is frankly insulting that question would be asked.”

Bernie Sanders said “most people” would side with Comey because the president has repeatedly lied.

"Unfortunately, most people would agree with Mr. Comey. On issue after issue after issue, Trump has blatantly lied,” the Vermont lawmaker said, concluding that lack of trust in the president “diminishes the office of the president and our standing in the world."

Trump fired Comey amid an ongoing investigation into the Trump campaign's ties with Russia.

Comey’s testimony confirmed reports that Trump asked him to pledge his loyalty and let “go” of his investigation into former national security adviser Michael Flynn.

The former FBI chief said special counsel Robert Mueller will determine through his investigation if the president’s actions make it an obstruction of justice case.