President Trump’s nominee for deputy attorney general declined Tuesday to endorse the appointment of a special prosecutor to investigate ties between the Trump campaign and Russian officials, bucking pressure from Democrats.

Speaking in a calm, firm tone, Rod Rosenstein refused “on principle” to describe how he would handle any individual case.

“I view it as a matter of principle. As a nominee for deputy attorney general, I should not be promising to take action on a particular case,” Rosenstein said. “My view is that I have a responsibility when I take that oath — I cannot take it on condition upon how I will handle a particular case.”

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The hearing for Rosenstein took on added importance last week after Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE recused himself from any investigations related to Russian interference in the 2016 presidential election.

As the Justice Department’s second-in-command, Rosenstein would assume control of any investigation that Sessions recused himself from.

Underscoring the unusual interest in Rosenstein’s role, the Dirksen Office Building hearing room was jammed with spectators on Tuesday. Sen. Lindsey Graham Lindsey Olin GrahamSenate Republicans signal openness to working with Biden Loeffler calls for hearing in wake of Netflix's 'Cuties' Quinnipiac poll shows Graham, Harrison tied in South Carolina Senate race MORE (R-S.C.) at one point had to squeeze his way between rows of chairs and a packed press table to exit.

Rosenstein, a respected prosecutor who has served five presidents, seemed unfazed by the attention.

In an occasionally tense exchange with Senate Judiciary Committee ranking member Dianne Feinstein Dianne Emiel FeinsteinSenators offer disaster tax relief bill Democrats back away from quick reversal of Trump tax cuts Congress must save the Postal Service from collapse — our economy depends on it MORE (D-Calif.), Rosenstein argued that without the underlying facts — which only current officials would know — he could not be asked to make a determination on whether a special prosecutor on Russian interference is needed.

"I'm simply not in a position to answer that," he said.

Rosenstein went only so far as to commit to appoint a special counsel “whenever I determine it’s appropriate based on the policies and procedures of the Department of Justice.”

During the hearing, Rosenstein repeatedly disavowed any knowledge beyond what he has “read in the papers,” and the hearing quickly evolved into a crossfire between Republicans on the defensive and Democrats determined to force the issue.

Democrats can do little to halt Rosenstein’s confirmation, although they can slow-walk the process. Despite praising his experience, Sen. Richard Blumenthal (D-Conn.) has vowed to use “every possible tool” to block the nomination unless he commits to appointing an independent prosecutor.

Republicans from the start pushed back on calls for a special counsel.

Committee Chairman Chuck Grassley Charles (Chuck) Ernest GrassleySenate Republicans signal openness to working with Biden Senators offer disaster tax relief bill Trump spikes political football with return of Big Ten season MORE (R-Iowa) kicked off proceedings with a fierce rebuttal, arguing, "The notion that somehow a special counsel will bring facts to light just isn’t true.

"Any insinuation that Mr. Rosenstein lacks the impartiality and professionalism to handle these kind of matters is out of line. His independence is beyond reproach."

Democrats were careful to separate their calls for an independent prosecutor from their assessment of Rosenstein’s professionalism and experience.

Rosenstein, who has spent nearly 12 years as the United States attorney for Maryland, has more than once been involved in politically charged cases during his career.

He worked on Kenneth Starr’s independent counsel investigation into the Whitewater affair during the Clinton administration and oversaw the investigation into retired Gen. James E. “Hoss” Cartwright in a high-profile leak case last year.

Pressed by Grassley, Rosenstein said he was "not aware of any" reason why he would need to recuse himself from any investigations into Russian contacts with the Trump campaign.

"The bottom line is that it’s my job to make sure all investigations are conducted independently,” he said.