Levin pointed out that Hagel, a former Republican senator from Nebraska, has complied with the same disclosure requirements that past nominees from Republican presidents underwent. He added that it is unprecedented for a secretary of Defense nominee to be filibustered by the minority party.

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“A filibuster at this time with a budget crisis is ill-advised,” Levin said. “Perhaps most important, having a Department of Defense without a new nominee confirmed harms the men and women serving our country.”

Senate Majority Leader Harry ReidHarry ReidRepublican failure Senate about to enter 'nuclear option' death spiral Top GOP senator: 'Tragic mistake' if Democrats try to block Gorsuch MORE (D-Nev.) has filed a motion to end debate on Hagel's nomination and move to a final vote. The vote to end debate — which requires 60-votes — is scheduled for Friday, but it doesn't appear that Democrats have the votes.

While Hagel served as a Republican senator just more than four years ago, his views on Iran, Iraq and Israel led to a fiery debate over his nomination. Hagel went through a rough confirmation hearing last week, enduring tough questions from Republican senators and turning in an uneven performance. 

Since then, Sen. James InhofeJames InhofeOptimism rising for infrastructure deal Repeal of Obama drilling rule stalls in the Senate GOP senator: EPA 'brainwashing our kids' MORE (R-Okla.) and other senate Republicans have demanded more information about speeches the nominee gave and his compensation for them. Sen. Ted CruzTed CruzTHE MEMO: Frustrated Trump looks to turn it around Trump: 'No doubt' we'll make a deal on healthcare Wounded Ryan faces new battle MORE (R-Texas) at a hearing this week suggested the speeches were given to extreme or radical groups, a statement some Democrats have criticized.

Levin called Cruz’s comments “inappropriate, unfair and untrue.”

Sens. Patrick LeahyPatrick LeahySenate braces for fallout over Supreme Court fight Register of copyrights should be presidential appointee GOP senator on going nuclear: 'I really hope that it doesn't come to that' MORE (D-Vt.) and Richard BlumenthalRichard BlumenthalSenators introduce new Iran sanctions Senators demand Pentagon action after nude photo scandal Gorsuch rewrites playbook for confirmation hearings MORE (D-Conn.) also came to the Senate floor Thursday to express their support for Hagel. Both senators touted Hagel's experience as a veteran and senator as reason enough to explain his qualifications.

“Is he qualified?” Blumenthal said. “We may have someone whom we would make our first choice … but that’s not the question before us. It is whether he is qualified to be part of the president’s team and to be held accountable for the policies the president sets.”