Rod Rosenstein is expected to be grilled Thursday on back-to-back political bombshells that have rattled the nation’s capital.

The deputy attorney general will brief all senators on Thursday afternoon behind closed doors, giving many lawmakers their first face-to-face meeting with an administration official since President Trump’s surprise decision to fire former FBI Director James Comey.

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In the wake of intense pressure from Democrats, Rosenstein announced Wednesday evening that former FBI Director Robert Mueller will serve as special counsel to probe any election collusion between Russia and the Trump campaign. Rosenstein had previously declined to appoint a special counsel.

Senators will lob questions at the newly minted deputy attorney general, who recommended Comey’s firing in a memo to Trump before the FBI chief was terminated last week. The timing of Rosenstein’s decision to tap Mueller will surely come up on Thursday and whether Rosenstein consulted the White House before making his decision.

Asked on what he wanted to hear from Rosenstein, Sen. Lindsey Graham Lindsey Olin GrahamThe Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Senate Democrats' campaign arm announces seven-figure investment to boost Graham challenger Graham: Comey to testify about FBI's Russia probe, Mueller declined invitation MORE (R-S.C.) said, “It’s pretty simple: Did you support the decision to fire [Comey] and tell us about the letter and how it came about.”

Another issue that is likely to come up is whether Rosenstein was aware of the memo that Comey reportedly wrote after Trump allegedly suggested that the FBI director back off in the probe of former national security adviser Michael Flynn.

Rosenstein became a lightning rod over Comey’s firing when the White House initially tried to hang the decision on a memo from Rosenstein that criticized Comey’s handling of the investigation into Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE’s use of a private email server while secretary of State.

Rosenstein’s memo stated that “the FBI’s reputation and credibility have suffered substantial damage” since 2016. Trump later told NBC News that he was prepared to fire Comey no matter the recommendation from Rosenstein and 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.

The political landmines awaiting Rosenstein are a dramatic shift from the bipartisan praise he received during his confirmation hearing. Democrats lauded him as a potential check on Sessions, whom they don’t trust with the Russia investigation and worry will steer the administration to the hard right.

Only six Democrats — four of whom are viewed as potential 2020 presidential candidates — voted against Rosenstein’s nomination. By comparison, only one — Sen. Joe Manchin Joseph (Joe) ManchinBiden promises Democratic senators help in battleground states Senate leaders quash talk of rank-and-file COVID-19 deal OVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' MORE (W.Va.) — voted for Sessions. All Republicans backed Rosenstein in the 94-6 roll call.

Rosenstein, 52, has been involved in many high-profile cases at the Justice Department. For example, then-Attorney General Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings MORE tapped Rosenstein to find out who was leaking classified information about the U.S. cyberattack efforts against Iran. Retired Marine Gen. James Cartright subsequently pleaded guilty.

Senate Minority Leader Charles Schumer Chuck SchumerMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security Warren, Schumer introduce plan for next president to cancel ,000 in student debt Schumer lashes out at Trump over 'blue states' remark: 'What a disgrace' MORE (D-N.Y.) voted to confirm Rosenstein, saying the nominee had a “reputation for integrity.”

Sen. 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.), the ranking member on the Judiciary Committee, also backed Rosenstein because of his “impressive credentials” while also warning against the danger of the Justice Department becoming politicized.

But that admiration for Rosenstein has dissolved into frustration and confusion for many Democrats, who had been irritated with Rosenstein’s initial reluctance to appoint a special counsel.

Feinstein and 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, had explicitly called for Rosenstein to resign if he refused to name a special counsel.

While Thursday’s briefing is not open to the press, it’s likely that details of the meeting will be leaked.

Senate Republicans had suggested a special counsel wasn’t necessary, noting ongoing investigations had already begun — including one by the Senate Intelligence Committee. However, a handful of moderate GOP lawmakers had left the door open to a special counsel.

The push for Rosenstein to testify is the first of a growing list of Democratic demands in the wake of Comey’s firing. Democrats also want Sessions to meet with senators, Trump to release any potential recordings of his conversations and Comey to testify publicly.

The Senate Intelligence Committee has issued an invitation to Comey to testify before the committee, and the Senate Judiciary Committee is expected to issue a similar invitation.

Sen. Sheldon Whitehouse Sheldon WhitehouseLWCF modernization: Restoring the promise Restaurant owner defends calamari as 'bipartisan' after Democratic convention appearance Warren calls on McConnell to bring Senate back to address Postal Service MORE (D-R.I.) called the briefing with Rosenstein an “important step” before pivoting to the importance of having Comey himself come and speak to members about the reported memo.

Asked if he is hopeful that Rosenstein would be able to provide clarity, Sen. John Thune John Randolph ThuneThe Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks Senate GOP eyes early exit MORE (R-S.D.) responded: “I would like to think he is in the position to know the answer to a lot our questions, so I think that would be helpful. But I also think it’s important that Comey appear here and speak to members of Congress in an open setting.”