Graham questions if Rosenstein can remain in charge of Mueller probe
© Greg Nash
GOP Sen. Lindsey GrahamLindsey Olin GrahamGOP senators divided over approach to election security GOP lawmakers want Mulvaney sidelined in budget talks Trump urged to quickly fill Pentagon post amid Iran tensions MORE (S.C.) is questioning if Deputy Attorney General Rod RosensteinRod RosensteinTrump: Appointing Sessions was my biggest mistake Trump blasts Mueller, decries 'witch hunt' at 2020 launch Trump: I didn't fire Mueller since firings 'didn't work out too well' for Nixon MORE can remain in charge of special counsel Robert MuellerRobert (Bob) Swan MuellerKamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Dem committees win new powers to investigate Trump Schiff says Intel panel will hold 'series' of hearings on Mueller report MORE's probe into the 2016 election. 
 
Graham said he believes Rosenstein is "conflicted" because of the Justice Department official's role in the firing of then-FBI Director James ComeyJames Brien ComeyBiden is the least electable candidate — here's why Top Mueller prosecutor Andrew Weissmann lands book deal Trump to appear on 'Meet the Press' for first time as president MORE. Rosenstein drafted a memo that the Trump administration initially used to justify the firing. 
 
"If you're looking at obstruction of justice misconduct post-presidency, the Comey firing as being a form of obstruction of justice, then Rosenstein is a key witness in that and you can't be a witness and oversee the investigation," Graham told reporters on Tuesday
 
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Graham's comments come after he sent Rosenstein a letter, dated from late last month, questioning his role overseeing the investigation into Russia's election interference and potential collusion between the Trump campaign and Moscow. 
 
Graham noted in the letter that it has been "widely reported" that Mueller's probe also includes investigating if President TrumpDonald John TrumpConway defends herself against Hatch Act allegations amid threat of subpoena How to defuse Gulf tensions and avoid war with Iran Trump says 'stubborn child' Fed 'blew it' by not cutting rates MORE obstructed the Russia investigation by firing Comey. 
 
"Do you consider yourself a potential witness in the Mueller investigation regarding the firing of Director Comey by President Trump?" Graham asked in the letter. 
 
If the answer is yes, Graham then asked if Rosenstein believes he should step back from the Mueller probe.
 
Graham indicated on Tuesday that Rosenstein had not yet responded to his letter. 
 
"He's a fine man, very ethical, good guy, but we're going to play this thing straight," Graham said. "Here's the question for Rosenstein, if you're going to be a fact witness as to why Comey was fired, how do you stay involved?" 
 
The White House initially pointed to Rosenstein's memo, which took aim at Comey's handling of the probe into Hillary ClintonHillary Diane Rodham ClintonThe Hill's Morning Report - Crunch time arrives for 2020 Dems with debates on deck The Memo: All eyes on faltering Biden ahead of first debate Trump says he's not prepared to lose in 2020 MORE's private email server, as the basis for his firing. But Trump later indicated he was prepared to fire Comey regardless of the recommendation from the Justice Department. 

"I was going to fire Comey. There's no good time to do it, by the way," he told NBC News last year, calling Comey a "showboat" and "grandstander."

Rosenstein has reportedly explored potentially stepping back from the Russia investigation. 
 
CNN reported in April that Rosenstein consulted with ethics officials about his role. And sources told ABC News in June 2017 that Rosenstein raised the issue with Rachel Brand, who was the No. 3 Justice Department official at the time. 
 
Rosenstein has emerged as a controversial figure in the Russia investigation. 
 
He initially enraged Democrats for the memo he wrote on Comey. More recently, he's emerged as a top target for Trump and his conservative allies on Capitol Hill, some of whom have urged the president to fire the deputy attorney general. 
 
"I am being investigated for firing the FBI Director by the man who told me to fire the FBI Director! Witch Hunt,” Trump said in a tweet about Rosenstein last year. 
 
 
Trump reiterated on Tuesday that he would not have picked Sessions to be his attorney general if he had known that he was going to recuse himself. 

"The Russian Witch Hunt Hoax continues, all because Jeff Sessions didn’t tell me he was going to recuse himself...I would have quickly picked someone else. So much time and money wasted, so many lives ruined...and Sessions knew better than most that there was No Collusion!" Trump said in a tweet.