MSNBC’s Rachel Maddow outlined 15 questions she said still remain after special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s investigation, HuffPost reported.

Among the questions Maddow said were still “driving [her] nuts” were whether President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE would acknowledge Russian interference in the election, whether Mueller expected Attorney General William Barr Bill BarrProsecutor says no charges in Michigan toilet voting display Judge rules Snowden to give up millions from book, speeches The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE to make a determination on whether Trump obstructed justice, whether Mueller’s full report will be released and whether the completion of Mueller’s probe will affect other ongoing investigations.

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Maddow also raised the question of whether Mueller declined to state Trump had committed crimes in order “to protect a future grand jury.”

“One of the reasons it might not be proper for a prosecutor, for any prosecutor or for the Department of Justice, more broadly, to jump in and make a pronouncement that a president appears to have committed crimes is because of the possibility that that president could actually be indicted and prosecuted and put on trial for those crimes after he or she has left office,” she said.

Maddow also questioned whether Congress would have a chance to review Mueller’s underlying evidence and whether Mueller himself would testify before Congress about his findings.

On Tuesday morning, Sen. Richard Blumenthal (D-Conn.) also said Mueller should testify, saying he does not "deeply respect and trust the Barr summary.”

On Monday night, White House press secretary Sarah Huckabee Sanders included Maddow's image in a "bracket" mocking pundits and politicians she said overhyped the issue of Russian collusion.