Deputy Attorney General Rod Rosenstein dropped two bombshells during a hotly anticipated appearance before the Senate on Thursday, less than 24 hours after he announced the appointment of a special counsel in the FBI’s investigation into Russian meddling in the presidential election.

According to lawmakers, Rosenstein confirmed that the bureau’s investigation is no longer strictly a counterintelligence investigation — a kind of probe that does not normally result in charges — but also a criminal one.

He also said he was aware President Trump intended to fire Comey prior to penning a memo that the White House later used as its justification for the dismissal.

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Lawmakers emerged from the closed-door meeting painting a sober picture of the briefing. Sen. Christopher Coons Christopher (Chris) Andrew CoonsBiden promises Democratic senators help in battleground states Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (D-Del.) described the mood in the room as serious and thoughtful.

Across town, as lawmakers descended into a secure facility to receive the briefing, Trump was ripping the appointment of the special counsel as something that “hurts the country.”

“I believe it hurts the country terribly, because it shows we’re a divided, mixed-up, not-unified country,” Trump told news anchors at a luncheon at the White House.

But Republicans declined to echo the president’s outrage amid an increasingly bipartisan swirl of concern that the White House may have tried to interfere with the FBI’s investigation.

"The president is entitled to his opinion, but we’re a nation of laws. ... The acting attorney general has the authority to appoint a special counsel and has done so,” Sen. Marco Rubio Marco Antonio RubioFlorida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings MORE (R-Fla.) told reporters.

Rosenstein met with lawmakers for more than an hour but apparently gave few details about the decisionmaking process for firing Comey, including the role of 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, who instructed him to write the Comey memo or any conversations he had with Trump.

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“He declined to answer in any meaningful way questions about the process that lead to the decision to fire Jim Comey — the preparation of his memo, who told him [to write it],” Coons said, adding that he was asked whether he was directed to produce the memo multiple times.

Sen. Mark Warner Mark Robert WarnerIntelligence chief says Congress will get some in-person election security briefings Overnight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' House approves bill to secure internet-connected federal devices against cyber threats MORE (Va.), the top Democrat on the Senate Intelligence Committee, added that Rosenstein “did not answer specifics on virtually any question that was asked.”

But senators — in part reassured by the selection of former FBI Director Robert Mueller as a special prosecutor — signaled they were willing to give forgive Rosenstein's tight-lipped stance if it was meant to protect the FBI's investigation.

"As it became clear how little he was willing to talk about, it also became clear how broad this investigation that Mueller is about to undertake actually is," Sen. Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (D-Conn.) told reporters.

Sen. Dick Durbin Richard (Dick) Joseph DurbinMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled Senate Republicans signal openness to working with Biden Top GOP senator calls for Biden to release list of possible Supreme Court picks MORE (Ill.), the No. 2 Senate Democrat, said, "there was some frustration” in the room.

“People wanted questions answered ... [but] it's not an unreasonable position for him to take. People were respectful and thankful he showed up. He showed up. He didn’t have to.”

Democrats pointed to Sessions's role as one of their top unanswered questions leaving the briefing. Sessions recused himself earlier this year from the FBI’s investigation but was involved in the decision to fire Comey — a move Democrats argue violated his promise.

“Many of us, including myself, asked that question,” Durbin said. “I can't square Sessions's recusal with his role in dismissing the person who was in charge of the investigation."

Rosenstein will cross the Capitol on Friday to hold an identical meeting with House lawmakers. Democrats also want Sessions to meet with all senators during a separate closed-door briefing.

Sen. Bill Cassidy (R-La.) told reporters that Rosenstein was concerned that any comments he made to senators in the closed-door briefing “would be made public to press, so therefore he felt limited in what he could say.”

Lawmakers on the Senate Intelligence and Judiciary committees reportedly expressed concerns during the meeting that Mueller’s appointment will interfere with Congress’s ability to investigate election meddling — and possibly preclude testimony by Comey.

Multiple committees have been clamoring for Comey to appear on the Hill to describe both the circumstances surrounding his dismissal and answer questions about any interference in the FBI’s investigation by the White House.

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Coons called the impact of the appointment on Comey’s testimony “an open question.”

Both the Intelligence and Judiciary Committees are conducting their own probes into Russian interference in the election. Congressional investigations often cede jurisdiction to any concurrent federal investigations — a coordinating process called “deconfliction.”

Rosenstein on Wednesday gave former Mueller control of not only the investigation into whether Trump campaign associates coordinated with Russia but also any other matters that “may arise directly from the investigation” — like Comey’s dismissal.

Asked about the potential that the competing investigation could limit who appears before their committee, Warner called it a "great question" but that he and Sen. Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (R-N.C.) needed more information from Mueller.

“In many ways our purview is broader than what may be some of the Justice Department/FBI investigation," he added, defending the need to continue the congressional investigations.

There was one moment of levity in the breifing, lawmakers said.

One senator reportedly asked Rosenstein, very gravely, “I insist that you answer the one question that is on all our minds: How do we appropriately pronounce your name?”

“Rosen-stine” is correct, he replied.