Mr Rosenstein has been overseeing the Russian Federation probe since shortly after attorney general Jeff Sessions recused himself.
The President's tweet sparked immediate speculation about the future of the official, Rod Rosenstein, who wrote a memo recommending Comey be ousted and also later approved the appointment of a special counsel - Robert Mueller - to lead the Russian Federation probe.
All previous investigations have mostly been about Russia's meddling in the presidential election, and, as James Comey confirmed, Trump was never personally under investigation.
This tweet, of course, is based on Trump's narrative about the "memo" supposedly written by Rosenstein recommending the FBI director's firing because Comey had been unfair to Clinton by announcing the investigation into her email account just a week before the election.
And as Rep. Ted Lieu (D-Calif.) declared in a tweet Thursday, "If Trump fired Mueller (he'd also have to fire Dep AG Rosenstein), it would be an 11 on the Richter scale of #obstructionofjustice".
Trump weighed in on Twitter Thursday morning with a pair of posts.
President Donald Trump has appeared to acknowledge he is under investigation in the inquiry into alleged Russian meddling in the United States election.
U.S. Sen. Dianne Feinstein, a Democrat from California, said she is becoming "increasingly concerned" that Trump will terminate both Mueller and Rosenstein. However, Trump later asserted that he had already made the decision himself to fire Comey.
EU Parliament negotiator wants Brexit clarity from London soon
The Conservatives have been locked in talks with the socially conservative party founded by the late Ian Paisley since the results of the election emerged last week.
The inquiry's apparent expansion to target Trump reportedly focuses on whether the president attempted to obstruct the investigation - in particular, on Trump's reported attempts to encourage former FBI director James Comey to end an investigation into former national security adviser Michael Flynn.
"You are witnessing the single greatest WITCH HUNT in American political history - led by some very bad and conflicted people!".
The transition official said the organization has also separately asked the General Services Administration to preserve records from the Trump transition that were transferred to its facilities after Trump's inauguration.
Although he was strongly critical of some of Comey's testimony, the president said last week that the former Federal Bureau of Investigation chief had vindicated him when he said that while he was at the agency, Trump was not the subject of the FBI's Russian Federation probe. Since then Mueller, who served as FBI director before Comey, has taken over the investigation.
Harvard law professor Noah Feldman argues in a Bloomberg View article that Trump's tweet could force Rosenstein's recusal because of his suggestion that Comey's firing was Rosenstein's idea.
In recent weeks, there has been a lot of reporting that Trump has grown frustrated that there is a "Russia cloud" hovering over his presidency and wants to find a way to remove it.
The Twitter attacks came as Vice-President Mike Pence hired a personal lawyer to represent him in the intensifying investigation.
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