Sen. Maggie Hassan Margaret (Maggie) HassanCongress needs to prioritize government digital service delivery Senate Democrats demand answers on migrant child trafficking during pandemic Hillicon Valley: Feds warn hackers targeting critical infrastructure | Twitter exploring subscription service | Bill would give DHS cyber agency subpoena power MORE (D-N.H.) said Monday she will not vote to confirm President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE's pick for attorney general, William Barr, citing his views on executive power and the special counsel's investigation.

"I have continued to be concerned with Mr. Barr’s very broad view of executive authority, especially given that we are still in the middle of the Mueller investigation," Hassan said on CNN, referring to 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.

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"As I listened to his testimony he really wasn’t committing to allowing Mr. Mueller to follow the facts wherever they lead, and he has a very broad view of executive privilege, which makes me believe he is conflicted and compromised here," she continued. "So I won’t be supporting his nomination."

Democratic @SenatorHassan tells @PoppyHarlowCNN she won't vote to confirm Trump's AG nominee William Barr: "He has a very broad view of executive privilege which makes me believe he is conflicted and compromised" on the Mueller investigation. https://t.co/GxEiJEYUtX pic.twitter.com/qGvDqPqe3g — CNN Newsroom (@CNNnewsroom) January 28, 2019

Hassan joins a handful of other Democratic senators who have already said they will oppose Barr's nomination.

Senate Minority Leader Charles Schumer Chuck SchumerVideo of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Graham signals support for confirming a Supreme Court nominee this year Pelosi orders Capitol flags at half-staff to honor Ginsburg MORE (D-N.Y.) and others have expressed concerns, citing Barr's refusal in a private meeting to unequivocally say he won’t interfere with the Russia investigation and refusal to commit to releasing the special counsel’s report.

The Senate Judiciary Committee is scheduled to meet Tuesday to discuss Barr's nomination and other business, though it is unlikely that the panel will actually vote on Barr's nomination during the meeting. The nominee is expected to pass through committee, where Republicans hold a two-seat majority.

Republicans hold 53 seats in the Senate, meaning every Democratic senator, plus four GOP senators, would need to vote against Barr to sink his nomination.