USA president Donald Trump appeared to confirm he is under investigation for obstruction of justice, as he lashed out at what he described as a "witch hunt" against him. He subsequently appointed Mueller as special counsel for the investigation into Russian efforts to interfere in the 2016 election.
Deputy Attorney General Rod Rosenstein submitted a widely circulated memo to the president last month raising concerns over Comey's performance, but Trump later asserted that he had already made the decision himself to fire Comey.
All the stories about Mueller investigating Trump for possible obstruction cited anonymous sources.
Trump's tweet comes on the heels of a vague statement on the investigation from Rosenstein, released late on Thursday, and the spate of exclusive stories about the latest developments.
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In another tweet Friday morning, Trump said it's "sad" that seven months of investigations and hearings into possible links between his campaign and Russian Federation have been fruitless.
Durbin, speaking on WGN radio, said he hoped the response to Trump firing Mueller would be bipartisan if it occurred. Comey testified that Trump directed him in February to drop an FBI investigation into former national security adviser Michael Flynn relating to the Russian Federation matter.
The Democratic National Committee said it saw a need for Rosenstein to recuse himself, but it said control over the investigation should be given to Mueller and not another Trump appointee.
The widened Russian Federation probe could have far-reaching repercussions for Trump s presidency, transforming his closest aides into witnesses and sucking yet more political oxygen out of the West Wing. Terming Comey's allegations untrue, Trump later said he was willing to testify under oath but Mueller's reported investigation into the president's actions means that Trump will have to live with the ghost of another probe reaching to the White House.
The Justice Department did not immediately respond to CNBC's request for comment.
The transition order came the same day that Vice President Mike Pence's confirmed that he had hired a private lawyer to represent his interests in the expanding probe. Trump said last week he felt vindicated by Comey's 8 June testimony that he was not the subject of investigation while Comey headed the agency.