White House deputy press secretary Sarah Huckabee Sanders will fill in for press secretary Sean Spicer Sean Michael SpicerKellyanne Conway to leave White House at end of month Pro-Trump duo Diamond and Silk launch new program on Newsmax TV The Hill's 12:30 Report - Presented by Facebook - Supreme Court's unanimous decision on the Electoral College MORE at this week's press briefings.

Sanders conducted her first official White House press briefing on Friday. 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 was reportedly happy with her performance.

Spicer will be fulfilling his U.S. Navy Reserve duty this week, Politico reported Wednesday.

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Sanders on Wednesday will handle the first White House briefing since President Trump fired FBI Director James Comey James Brien ComeyBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Michael Cohen book debuts at top of bestseller list Trump offered Kelly FBI director's job, demanded loyalty: report MORE on Tuesday. Comey had been leading the FBI’s investigation into the Trump campaign’s potential ties to Russia.

Sanders appeared on cable news shows late Tuesday and early Wednesday to speak about Trump’s decision.

She told MSNBC’s “Morning Joe” that Comey’s dismissal had nothing to do with the Russia probe.

“Absolutely not,” she said. “There's no evidence of any collusion.”