Story highlights The press briefing came one day after the abrupt firing of FBI Director James Comey

Sarah Huckabee Sanders filled in for press secretary Sean Spicer on Wednesday

Washington (CNN) FBI Director James Comey committed "atrocities" when investigating former Democratic presidential nominee Hillary Clinton's emails, deputy White House press secretary Sarah Huckabee Sanders said Wednesday.

Sanders addressed journalists just one day after President Donald Trump -- citing the recommendation of Deputy Attorney General Rod Rosenstein -- fired Comey, who was overseeing an ongoing FBI investigation into Russia's interference into the 2016 election. Sanders cited Comey's July news conference which he held without notifying his superiors at the Justice Department.

"I think also having a letter like the one that he (Trump) received, and having that conversation (with Rosenstein) that outlines the basic atrocities in circumventing the chain of command in the Department of Justice," Sanders said when asked why Trump's position on Comey changed since the campaign.

"Any person of legal mind and authority knows what a big deal that is, particularly in the Department of Justice; particularly for somebody like the deputy attorney general who has been part of the Justice Department for 30 years and is such a respected person," she added.

During the 2016 campaign, Trump commended Comey for his decision to send a letter to Congress that suggested the FBI was looking into Clinton's email server again. Many Democrats cite Comey's handling of the investigation as a major reason for Clinton's loss.

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